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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

Honors: Hispanic engineers group recognizes ORNL’s Idrobo

Posted at 9:33 pm August 18, 2014
By Oak Ridge National Laboratory Leave a Comment

Juan Carlos Idrobo

Juan Carlos Idrobo

Juan Carlos Idrobo, a researcher at Oak Ridge National Laboratory, has been recognized by the Hispanic Engineer National Achievement Award Corporation with the 2014 Outstanding Technical Achievement Award for groundbreaking research in scanning transmission electron microscopy of 2D materials.

Idrobo works in the Center for Nanophase Materials Sciences’ Microscopy group. The Ecuador native received his bachelor’s in physics from Universidad de Los Andes, Colombia; his master’s in physics from the University of Illinois at Chicago; and doctorate in physics from the University of California, Davis. He joined the ORNL research staff in 2010.

The award is associated with Great Minds in STEM, a nonprofit organization that advocates science, technology, engineering, and mathematics careers for the Hispanic community. [Read more…]

Filed Under: Honors and Spotlight, Oak Ridge National Laboratory, U.S. Department of Energy Tagged With: Center for Nanophase Materials Sciences, Great Minds in STEM, Hispanic Engineer National Achievement Award Corporation, Juan-Carlos Idrobo, microscopy, Oak Ridge National Laboratory, Office of Science, ORNL, Outstanding Technical Achievement Award, scanning transmission electron microscopy, Science Technology Engineering and Mathematics, U.S. Department of Energy, UT-Battelle

ORNL-UT researchers invent ‘sideways’ approach to 2-D hybrid materials

Posted at 7:49 am January 10, 2014
By Oak Ridge National Laboratory Leave a Comment

heterostructure-anping

ORNL and UT researchers have invented a method to merge different 2-dimensional materials into a seamless layer. This colorized scanning tunneling microscope image shows a single-atom sheet composed of graphene (seen in blue) combined with hexagonal boron nitride (seen in yellow).

Researchers at Oak Ridge National Laboratory and the University of Tennessee in Knoxville have pioneered a new technique for forming a two-dimensional, single-atom sheet of two different materials with a seamless boundary.

The study, published in the journal Science, could enable the use of new types of 2-D hybrid materials in technological applications and fundamental research.

By rethinking a traditional method of growing materials, the researchers combined two compounds—graphene and boron nitride—into a single layer only one atom thick. Graphene, which consists of carbon atoms arranged in hexagonal, honeycomb-like rings, has attracted waves of attention because of its high strength and electronic properties. [Read more…]

Filed Under: Front Page News, Oak Ridge National Laboratory, Science Tagged With: 2-D hybrid materials, An-Ping Li, boron nitride, Center for Nanophase Materials Science, David Siegel, Defense Advanced Research Projects Agency, epitaxy, Gong Gu, graphene, Heteroepitaxial Growth of Two-Dimensional Hexagonal Boron Nitride Templated by Graphene Edges, heterojunction, Jewook Park, Juan-Carlos Idrobo, Kendal Clark, Kevin McCarty, Lei Liu, Leonardo Basile, National Science Foundation, National Secretariat of Higher Education Science Technology and Innovation of Ecuador, Oak Ridge National Laboratory, Office of Science, ORNL, science, single-atom sheet, U.S. Department of Energy, University of Tennessee, UT, Wan Deng

ORNL electron microscopy unlocks graphene potential

Posted at 1:15 pm November 24, 2012
By Oak Ridge National Laboratory Leave a Comment

Silicon Atoms in Graphene

The atomic resolution Z-contrast images show individual silicon atoms bonded differently in graphene. (Photo by ORNL)

Electron microscopy at the Oak Ridge National Laboratory is providing unprecedented views of the individual atoms in graphene, offering scientists a chance to unlock the material’s full potential for uses from engine combustion to consumer electronics.

Graphene crystals were first isolated in 2004. They are two-dimensional (one-atom in thickness), harder than diamonds and far stronger than steel, providing unprecedented stiffness and electrical and thermal properties. By viewing the atomic and bonding configurations of individual graphene atoms, scientists are able to suggest ways to optimize materials so they are better suited for specific applications.

[Read more…]

Filed Under: Science, Top Stories Tagged With: electron microscopy, graphene, Juan-Carlos Idrobo, Oak Ridge National Laboratory, Office of Science, Physical Review Letters, researchers, U.S. Department of Energy

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Classifieds

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...]

ADFAC seeks contractors for five homes

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

Public notice: Draft environmental assessment for Y-12 Development Organization at Horizon Center

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

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