Doe Science news source
The DOE Science News Source is a Newswise initiative to promote research news from the Office of Science of the DOE to the public and news media.
  • 2018-01-09 14:00:44
  • Article ID: 687623

Breaking Bad Metals with Neutrons

  • Credit: Argonne National Laboratory

    A comparison of the theoretical calculations (top row) and inelastic neutron scattering data from ARCS at the Spallation Neutron Source (bottom row) shows the excellent agreement between the two. The three figures represent different slices through the four-dimensional scattering volumes produced by the electronic excitations.

By exploiting the properties of neutrons to probe electrons in a metal, a team of researchers led by the U.S. Department of Energy’s (DOE) Argonne National Laboratory has gained new insight into the behavior of correlated electron systems, which are materials that have useful properties such as magnetism or superconductivity.

The research, to be published in Science, shows how well scientists can predict the properties and functionality of materials, allowing us to explore their potential to be used in novel ways.

“How do you get to a stage where the models are reliable? This
paper shows that we can now theoretically model even extremely
complex systems. These techniques could accelerate our discovery of new materials.” — Ray Osborn, Argonne senior scientist

“Our mission from the Department of Energy is to discover and then understand novel materials that could form the basis for completely new applications,” said lead author Ray Osborn, a senior scientist in Argonne’s Neutron and X-ray Scattering Group.

Osborn and his colleagues studied a strongly correlated electron system (CePd3) using neutron scattering to overcome the limitations of other techniques and reveal how the compound’s electrical properties change at high and low temperatures. Osborn expects the results to inspire similar research.

“Being able to predict with confidence the behavior of electrons as temperatures change should encourage a much more ambitious coupling of experimental results and models than has been previously attempted,” Osborn said.

“In many metals, we consider the mobile electrons responsible for electrical conduction as moving independently of each other, only weakly affected by electron-electron repulsion,” he said. “However, there is an important class of materials in which electron-electron interactions are so strong they cannot be ignored.”

Scientists have studied these strongly correlated electron systems for more than five decades, and one of the most important theoretical predictions is that at high temperatures the electron interactions cause random fluctuations that impede their mobility.

“They become ‘bad’ metals,” Osborn said. However, at low temperatures, the electronic excitations start to resemble those of normal metals, but with much-reduced electron velocities.

The existence of this crossover from incoherent random fluctuations at high temperature to coherent electronic states at low temperature had been postulated in 1985 by one of the co-authors, Jon Lawrence, a professor at the University of California, Irvine. Although there is some evidence for it in photoemission experiments, Argonne co-author Stephan Rosenkranz noted that it is very difficult to compare these measurements with realistic theoretical calculations because there are too many uncertainties in modeling the experimental intensities.

The team, based mainly at Argonne and other DOE laboratories, showed that neutrons probe the electrons in a different way that overcomes the limitations of photoemission spectroscopy and other techniques.

Making this work possible are advances in neutron spectroscopy at DOE’s Spallation Neutron Source (SNS) at Oak Ridge National Laboratory, a DOE Office of Science User Facility, and the United Kingdom’s ISIS Pulsed Neutron Source, which allow comprehensive measurements over a wide range of energies and momentum transfers. Both played critical roles in this study.

“Neutrons are absolutely essential for this research,” Osborn said. “Neutron scattering is the only technique that is sensitive to the whole spectrum of electronic fluctuations in four dimensions of momentum and energy, and the only technique that can be reliably compared to realistic theoretical calculations on an absolute intensity scale.”

With this study, these four-dimensional measurements have now been directly compared to calculations using new computational techniques specially developed for strongly correlated electron systems. The technique, known as Dynamical Mean Field Theory, defines a way of calculating electronic properties that include strong electron-electron interactions.

Osborn acknowledged the contributions of Eugene Goremychkin, a former Argonne scientist who led the data analysis, and Argonne theorist Hyowon Park, who performed the calculations. The agreement between theory and experiments was “truly remarkable,” Osborn said.

Looking ahead, researchers are optimistic about closing the gap between the results of condensed matter physics experiments and theoretical models.

“How do you get to a stage where the models are reliable?” Osborn said. “This paper shows that we can now theoretically model even extremely complex systems. These techniques could accelerate our discovery of new materials.”

Other Argonne authors of the paper, titled “Coherent Band Excitations in CePd3: A Comparison of Neutron Scattering and ab initio Theory,” are Park and John-Paul Castellan of the Materials Science Division. Also contributing to this work were researchers at the Joint Institute for Nuclear Research in Russia; the University of Illinois at Chicago; Karlsruhe Institute of Technology in Germany; Oak Ridge National Laboratory; Los Alamos National Laboratory and the University of California at Irvine.

Research at Argonne and Los Alamos was funded by DOE’s Materials Sciences and Engineering Division of the Office of Basic Energy Sciences. Research at Oak Ridge’s SNS was supported by the Scientific User Facilities Division of the Office of Basic Energy Sciences. Neutron experiments were performed at the SNS and the ISIS Pulsed Neutron Source, Rutherford Appleton Laboratory in the UK. Blues, a high-performance computing cluster operated by the Laboratory Computing Resource Center at Argonne, also contributed to this research.

Argonne National Laboratory seeks solutions to pressing national problems in science and technology. The nation's first national laboratory, Argonne conducts leading-edge basic and applied scientific research in virtually every scientific discipline. Argonne researchers work closely with researchers from hundreds of companies, universities, and federal, state and municipal agencies to help them solve their specific problems, advance America's scientific leadership and prepare the nation for a better future. With employees from more than 60 nations, Argonne is managed by UChicago Argonne, LLC for the U.S. Department of Energy's Office of Science.

The U.S. Department of Energy's Office of Science is the single largest supporter of basic research in the physical sciences in the United States and is working to address some of the most pressing challenges of our time. For more information, visit the Office of Science website.

X
X
X
  • Filters

  • × Clear Filters

Powering Up With a Smart Window

Window material repeatedly switches from being see-through to blocking the heat and converting sunlight into electricity.

Remnant Superconductivity From Invisible Stripes

Scientists used an intense light to unveil hidden rivers that transport electricity with no loss.

Columbia Researchers Squeeze Light into Nanoscale Devices and Circuits

Columbia investigators have made a major breakthrough in nanophotonics research, with their invention of a novel "home-built" cryogenic near-field optical microscope that has enabled them to directly image, for the first time, the propagation and dynamics of graphene plasmons at variable temperatures down to negative 250 degrees Celsius. If researchers can harness this nanolight, they will be able to improve sensing, subwavelength waveguiding, and optical transmission of signals.

Self-Assembling 3D Battery Would Charge in Seconds

A cross-campus collaboration led by Ulrich Wiesner, professor of engineering at Cornell University, has resulted in a novel energy storage device architecture that has the potential for lightning-quick charges for electronic devices.

Understanding the Generation of Light-Induced Electrical Current in Atomically Thin Nanomaterials

Scientists added an imaging capability to Brookhaven Lab's Center for Functional Nanomaterials that could provide the optoelectronic information needed to improve the performance of devices for power generation, communications, data storage, and lighting.

Diamond 'Spin-Off' Tech Could Lead to Low-Cost Medical Imaging and Drug Discovery Tools

An international team led by scientists at Berkeley Lab and UC Berkeley discovered how to exploit defects in nanoscale and microscale diamonds and potentially enhance the sensitivity of magnetic resonance imaging and nuclear magnetic resonance systems while eliminating the need for their costly and bulky superconducting magnets.

PROSPECTing For Antineutrinos

The Precision Reactor Oscillation and Spectrum Experiment (PROSPECT) has completed installation of a novel antineutrino detector that will probe the possible existence of a new form of matter - sterile neutrinos.

How to Cope with Cases of Mistaken Identity: MINERvA's Tale of Pions and Neutrinos

Neutral pion production is a major character in a story of mistaken identity worthy of an Agatha Christie novel.

Perfecting the Noise-Canceling Neutrino Detector

MicroBooNE neutrino experiment cuts through the noise, clearing the way for signals made by the hard-to-detect particle.

Supersonic Waves May Help Electronics Beat the Heat

Researchers at the Department of Energy's Oak Ridge National Laboratory made the first observations of waves of atomic rearrangements, known as phasons, propagating supersonically through a vibrating crystal lattice--a discovery that may dramatically improve heat transport in insulators and enable new strategies for heat management in future electronics devices.


  • Filters

  • × Clear Filters

Power to the People

The University of Utah College of Engineering has received a $2 million grant to create a laboratory and develop new technology for communities with backup power sources, known as microgrids, so they can quickly and more securely operate in the event of a massive power outage due to a natural disaster or cyberattack.

The U. S. Department of Energy Announces $34 Million for Small Business Research and Development Grants

U.S. Energy Secretary Rick Perry announced that the Department of Energy will award 219 grants totaling $34 million to 183 small businesses in 41 states. Funded through DOE's Small Business Innovation Research (SBIR) and Small Business Technology Transfer (STTR) programs, today's selections are for Phase I research and development.

Raising the Heat to Lower the Cost of Solar Energy

Sandia National Laboratories will receive $10.5 million from the Department of Energy to research and design a cheaper and more efficient solar energy system.The work focuses on refining a specific type of utility-scale solar energy technology that uses mirrors to reflect and concentrate sunlight onto a receiver on a tower.

Solar Turbines, Inc. Selects Penn State to Establish Center of Excellence in Gas Turbines

After completing an extensive evaluation of institutions of higher learning in the United States and Europe, Solar Turbines Incorporated has chosen Penn State as a university partner to establish a center of excellence in gas turbines. The center involves numerous faculty across Penn State's College of Engineering.

ORNL Facility Receives American Nuclear Society's Historic Landmark Designation

The American Nuclear Society has designated the Radiochemical Engineering Development Center at the Department of Energy's Oak Ridge National Laboratory an ANS Nuclear Historic Landmark, recognizing more than 50 years of isotope production and nuclear fuel cycle research.

Steven Cowley named director of DOE's Princeton Plasma Physics Laboratory

Steven Cowley, a theoretical physicist and international authority on fusion energy, has been named director of the U.S. Department of Energy's (DOE) Princeton Plasma Physics Laboratory (PPPL), effective July 1.

Scientists Turn X-ray Laser Into World's Fastest Water Heater

Scientists have used a powerful X-ray laser at the Department of Energy's SLAC National Accelerator Laboratory to heat water from room temperature to 100,000 degrees Celsius in less than a tenth of a picosecond, or millionth of a millionth of a second.

PNNL Part of a New National Center for Near-Atomic Resolution of Biological Molecules

A collaboration between the Pacific Northwest National Laboratory and Oregon Health & Science University has been chosen as a national center for a Nobel Prize-winning method of imaging, cryo-electron microscopy, that is revolutionizing structural biology.

SLAC Will Open One of Three NIH National Service Centers for Cryo-Electron Microscopy

The National Institutes of Health announced today that it will establish a national service and training center for cryogenic electron microscopy research at the Department of Energy's SLAC National Accelerator Laboratory.

Planck Collaboration Wins 2018 Gruber Cosmology Prize

The Planck Team--including researchers in Lawrence Berkeley National Laboratory's (Berkeley Lab's) Computational Research and Physics divisions--have been awarded the 2018 Gruber Cosmology Prize.


  • Filters

  • × Clear Filters

Powering Up With a Smart Window

Window material repeatedly switches from being see-through to blocking the heat and converting sunlight into electricity.

Remnant Superconductivity From Invisible Stripes

Scientists used an intense light to unveil hidden rivers that transport electricity with no loss.

Cracking the Code of Superconductivity and Magnetism

Neutron probes and theory reveal how electrons cooperate at lower temperatures.

The Secret to Measuring an Antineutrino's Energy

Scientists are developing better models that describe both neutrino and antineutrino data, which can offer insights into the nature of the universe.

How to Cope with Cases of Mistaken Identity: MINERvA's Tale of Pions and Neutrinos

Neutral pion production is a major character in a story of mistaken identity worthy of an Agatha Christie novel.

Perfecting the Noise-Canceling Neutrino Detector

MicroBooNE neutrino experiment cuts through the noise, clearing the way for signals made by the hard-to-detect particle.

Keeping Tabs on Polysulfides in Batteries

Optimizing lithium-sulfur battery electrolytes for long life.

Huge "Thermometer" Takes Temperatures of Tiny Samples

New spectroscopic technique measures heat in itty-bitty volumes that could reveal insights for electronics and energy technology.

Water, Water, Everywhere, but How Does It Flow?

Scientists use new X-ray technique to see how water moves at the molecular level.

Magnetized Plasmas That "Twist Light" Can Produce Powerful Microscopes and More

A non-twisting laser beam moving through magnetized plasma turns into an optical vortex that traps, rotates, and controls microscopic particles, opening new frontiers in imaging.


Spotlight

Monday May 07, 2018, 10:30 AM

Introducing Graduate Students Across the Globe to Photon Science

Brookhaven National Laboratory

Wednesday May 02, 2018, 04:05 PM

Students from Massachusetts and Washington Win DOE's 28th National Science Bowl(r)

Department of Energy, Office of Science

Thursday April 12, 2018, 07:05 PM

The Race for Young Scientific Minds

Argonne National Laboratory

Wednesday March 14, 2018, 02:05 PM

Q&A: Al Ashley Reflects on His Efforts to Diversify SLAC and Beyond

SLAC National Accelerator Laboratory

Thursday February 15, 2018, 12:05 PM

Insights on Innovation in Energy, Humanitarian Aid Highlight UVA Darden's Net Impact Week

University of Virginia Darden School of Business

Friday February 09, 2018, 11:05 AM

Ivy League Graduate, Writer and Activist with Dyslexia Visits CSUCI to Reframe the Concept of Learning Disabilities

California State University, Channel Islands

Wednesday January 17, 2018, 12:05 PM

Photographer Adam Nadel Selected as Fermilab's New Artist-in-Residence for 2018

Fermi National Accelerator Laboratory (Fermilab)

Wednesday January 17, 2018, 12:05 PM

Fermilab Computing Partners with Argonne, Local Schools for Hour of Code

Fermi National Accelerator Laboratory (Fermilab)

Wednesday December 20, 2017, 01:05 PM

Q&A: Sam Webb Teaches X-Ray Science from a Remote Classroom

SLAC National Accelerator Laboratory

Monday December 18, 2017, 01:05 PM

The Future of Today's Electric Power Systems

Rensselaer Polytechnic Institute (RPI)

Monday December 18, 2017, 12:05 PM

Supporting the Development of Offshore Wind Power Plants

Rensselaer Polytechnic Institute (RPI)

Tuesday October 03, 2017, 01:05 PM

Stairway to Science

Argonne National Laboratory

Thursday September 28, 2017, 12:05 PM

After-School Energy Rush

Argonne National Laboratory

Thursday September 28, 2017, 10:05 AM

Bringing Diversity Into Computational Science Through Student Outreach

Brookhaven National Laboratory

Thursday September 21, 2017, 03:05 PM

From Science to Finance: SLAC Summer Interns Forge New Paths in STEM

SLAC National Accelerator Laboratory

Thursday September 07, 2017, 02:05 PM

Students Discuss 'Cosmic Opportunities' at 45th Annual SLAC Summer Institute

SLAC National Accelerator Laboratory

Thursday August 31, 2017, 05:05 PM

Binghamton University Opens $70 Million Smart Energy Building

Binghamton University, State University of New York

Wednesday August 23, 2017, 05:05 PM

Widening Horizons for High Schoolers with Code

Argonne National Laboratory

Saturday May 20, 2017, 12:05 PM

Rensselaer Polytechnic Institute Graduates Urged to Embrace Change at 211th Commencement

Rensselaer Polytechnic Institute (RPI)

Monday May 15, 2017, 01:05 PM

ORNL, University of Tennessee Launch New Doctoral Program in Data Science

Oak Ridge National Laboratory

Friday April 07, 2017, 11:05 AM

Champions in Science: Profile of Jonathan Kirzner

Department of Energy, Office of Science

Wednesday April 05, 2017, 12:05 PM

High-Schooler Solves College-Level Security Puzzle From Argonne, Sparks Interest in Career

Argonne National Laboratory

Tuesday March 28, 2017, 12:05 PM

Champions in Science: Profile of Jenica Jacobi

Department of Energy, Office of Science

Friday March 24, 2017, 10:40 AM

Great Neck South High School Wins Regional Science Bowl at Brookhaven Lab

Brookhaven National Laboratory

Wednesday February 15, 2017, 04:05 PM

Middle Schoolers Test Their Knowledge at Science Bowl Competition

Argonne National Laboratory

Friday January 27, 2017, 04:00 PM

Haslam Visits ORNL to Highlight State's Role in Discovering Tennessine

Oak Ridge National Laboratory

Tuesday November 08, 2016, 12:05 PM

Internship Program Helps Foster Development of Future Nuclear Scientists

Oak Ridge National Laboratory

Friday May 13, 2016, 04:05 PM

More Than 12,000 Explore Jefferson Lab During April 30 Open House

Thomas Jefferson National Accelerator Facility

Monday April 25, 2016, 05:05 PM

Giving Back to National Science Bowl

Ames Laboratory

Friday March 25, 2016, 12:05 PM

NMSU Undergrad Tackles 3D Particle Scattering Animations After Receiving JSA Research Assistantship

Thomas Jefferson National Accelerator Facility

Tuesday February 02, 2016, 10:05 AM

Shannon Greco: A Self-Described "STEM Education Zealot"

Princeton Plasma Physics Laboratory

Monday November 16, 2015, 04:05 PM

Rare Earths for Life: An 85th Birthday Visit with Mr. Rare Earth

Ames Laboratory

Tuesday October 20, 2015, 01:05 PM

Meet Robert Palomino: 'Give Everything a Shot!'

Brookhaven National Laboratory

Tuesday April 22, 2014, 11:30 AM

University of Utah Makes Solar Accessible

University of Utah

Wednesday March 06, 2013, 03:40 PM

Student Innovator at Rensselaer Polytechnic Institute Seeks Brighter, Smarter, and More Efficient LEDs

Rensselaer Polytechnic Institute (RPI)

Friday November 16, 2012, 10:00 AM

Texas Tech Energy Commerce Students, Community Light up Tent City

Texas Tech University

Wednesday November 23, 2011, 10:45 AM

Don't Get 'Frosted' Over Heating Your Home This Winter

Temple University

Wednesday July 06, 2011, 06:00 PM

New Research Center To Tackle Critical Challenges Related to Aircraft Design, Wind Energy, Smart Buildings

Rensselaer Polytechnic Institute (RPI)

Friday April 22, 2011, 09:00 AM

First Polymer Solar-Thermal Device Heats Home, Saves Money

Wake Forest University

Friday April 15, 2011, 12:25 PM

Like Superman, American University Will Get Its Energy from the Sun

American University

Thursday February 10, 2011, 05:00 PM

ARRA Grant to Help Fund Seminary Building Green Roof

University of Chicago

Tuesday December 07, 2010, 05:00 PM

UC San Diego Installing 2.8 Megawatt Fuel Cell to Anchor Energy Innovation Park

University of California San Diego

Monday November 01, 2010, 12:50 PM

Rensselaer Smart Lighting Engineering Research Center Announces First Deployment of New Technology on Campus

Rensselaer Polytechnic Institute (RPI)

Friday September 10, 2010, 12:40 PM

Ithaca College Will Host Regional Clean Energy Summit

Ithaca College

Tuesday July 27, 2010, 10:30 AM

Texas Governor Announces $8.4 Million Award to Create Renewable Energy Institute

Texas Tech University

Friday May 07, 2010, 04:20 PM

Creighton University to Offer New Alternative Energy Program

Creighton University

Wednesday May 05, 2010, 09:30 AM

National Engineering Program Seeks Subject Matter Experts in Energy

JETS Junior Engineering Technical Society

Wednesday April 21, 2010, 12:30 PM

Students Using Solar Power To Create Sustainable Solutions for Haiti, Peru

Rensselaer Polytechnic Institute (RPI)





Showing results

0-4 Of 2215