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ORNL scientists uncover clues to role of magnetism in iron-based superconductors

Posted at 1:12 am August 25, 2014
By Oak Ridge National Laboratory Leave a Comment

Magnetism of Iron-based Superconductors

Oak Ridge National Laboratory scientists used scanning transmission electron microscopy to measure atomic-scale magnetic behavior in several families of iron-based superconductors. (Photo courtesy ORNL)

 

New measurements of atomic-scale magnetic behavior in iron-based superconductors by researchers at Oak Ridge National Laboratory and Vanderbilt University are challenging conventional wisdom about superconductivity and magnetism.

The study published in Advanced Materials provides experimental evidence that local magnetic fluctuations can influence the performance of iron-based superconductors, which transmit electric current without resistance at relatively high temperatures.

“In the past, everyone thought that magnetism and superconductivity could not coexist,” said ORNL’s Claudia Cantoni, the study’s first author. “The whole idea of superconductors is that they expel magnetic fields. But in reality things are more complicated.”

Superconductivity is strongly suppressed by the presence of long-range magnetism—where atoms align their magnetic moments over large volumes—but the ORNL study suggests that rapid fluctuations of local magnetic moments have a different effect. Not only does localized magnetism exist, but it is also correlated with a high critical temperature, the point at which the material becomes superconducting. [Read more…]

Filed Under: Front Page News, Oak Ridge National Laboratory, Science, U.S. Department of Energy Tagged With: Advanced Materials, Andrew May, Athena Safa-Sefat, atomic-scale magnetic behavior, Brian Sales, Center for Nanophase Materials Sciences, Claudia Cantoni, DOE, Elbio Dagotto, electric current, electron energy loss spectroscopy, iron-based superconductors, Jonathan Mitchell, Juan-Carlos Idrobo, magnetic moments, magnetic properties, magnetism, Matthew Chisholm, Michael McGuire, National Science Foundation, Oak Ridge National Laboratory, Office of Science, Orbital occupancy and charge doping in iron-based superconductors, ORNL, scanning transmission electron microscopy, superconductivity, superconductors, Tom Berlijn, U.S. Department of Energy, University of Tennessee Stephen Pennycook, Vanderbilt University, Wu Zhou

Neutrons, electrons, and theory reveal secrets of natural gas reserves

Posted at 11:10 pm October 28, 2013
By Oak Ridge National Laboratory Leave a Comment

Scanning Electronic Microscope Image of Unconventional Gas Reservoir

A scanning electron microscope image illustrating mineralogy and texture of an unconventional gas reservoir. Note that nanoporosity is not resolvable with this image. SANS and USANS analysis is required to quantify pore size distribution and interconnectivity. (Photo courtesy Oak Ridge National Laboratory)

Gas and oil deposits in shale have no place to hide from an Oak Ridge National Laboratory technique that provides an inside look at pores and reveals structural information potentially vital to the nation’s energy needs.

The research by scientists at the U.S. Department of Energy laboratory could clear the path to the more efficient extraction of gas and oil from shale, environmentally benign and efficient energy production from coal, and perhaps viable carbon dioxide sequestration technologies, according to Yuri Melnichenko, an instrument scientist at ORNL’s High Flux Isotope Reactor. [Read more…]

Filed Under: Front Page News, Oak Ridge National Laboratory, Science Tagged With: absorption, adsorption, carbon dioxide, coal, Cristian Contescu, electron microscopy, energy, Eugene Mamontov, gas, gas reservoir, General Purpose SANS, HFIR, High Flux Isotope Reactor, Hongxin Zhang, James Morris, Journal of Materials Chemistry A, Lilin He, Materials Science and Technology Division, Matthew Chisholm, Matthew Stone, Modern approaches to studying gas adsorption in nanoporous carbons, nanoporous carbon, National Energy Research Scientific Computing Center, natural gas, neutron scattering, Nidia Gallego, Oak Ridge National Laboratory, Office of Basic Energy Sciences, Office of Science, oil deposits, ORNL, pores, Raina Olsen, scanning electronic microscope, sequestration, shale, ShaRE User Facility, Spallation Neutron Source, Stephen Pennycook, U.S. Department of Energy, Valentino Cooper, Yungok Ihm, Yuri Melnichenko

ORNL-grown oxygen ‘sponge’ presents path to better catalysts, energy materials

Posted at 7:30 am August 29, 2013
By Oak Ridge National Laboratory Leave a Comment

ORNL Oxygen Sponge

This schematic depicts a new ORNL-developed material that can easily absorb or shed oxygen atoms. (Photo courtesy ORNL)

Scientists at Oak Ridge National Laboratory have developed a new oxygen “sponge” that can easily absorb or shed oxygen atoms at low temperatures. Materials with these novel characteristics would be useful in devices such as rechargeable batteries, sensors, gas converters, and fuel cells.

Materials containing atoms that can switch back and forth between multiple oxidation states are technologically important but very rare in nature, said ORNL’s Ho Nyung Lee, who led the international research team that published its findings in Nature Materials. [Read more…]

Filed Under: Oak Ridge National Laboratory, Science, Top Stories Tagged With: Advanced Photon Source, Argonne National Laboratory, brownmillerite, Center for Nanophase Materials Science, Chad Folkman, Dillon Fong, Dongwon Shin, Hiromichi Ohta, Ho Nyung Lee, Hokkaido University, Hyoungjeen Jeen, I-Cheng Tung, John Freeland, Matthew Chisholm, Michael Biegalski, Nanoscale Science Research Centers, Nature Materials, NSRC, Oak Ridge National Laboratory, Office of Science, ORNL, oxidation, oxygen atoms, oxygen sponge, perovskite, redox, reduction-oxidation, Reversible redox reactions in an epitaxially stabilized SrCoOx oxygen sponge, strontium cobaltite, U.S. Department of Energy, Woo Seok Choi

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Public Notice: NNSA announces no significant impact of Y-12 Development Organization operations at Horizon Center

AVAILABILITY OF THE FINAL ENVIRONMENTAL ASSESSMENT FOR THE OFFSITE HOUSING OF THE Y-12 DEVELOPMENT … [Read More...]

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Aid to Distressed Families of Appalachian Counties (ADFAC) is a non-profit community based agency, … [Read More...]

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