The advance is the result of investigative work done at the National Institute of Standards and Technology's Center for Neutron Research (NCNR), and at the National High Magnetic Field Laboratory (NHMFL) at Florida State University (FSU).
Stray magnetic fields suppress superconductivity, the resistance-free passage of electric current. But the object of the team's scrutiny—a uranium-ruthenium-silicon compound (URu2Si2)—somehow accommodates the normal adversity between magnetism and superconductivity. At 17.5 degrees above absolute zero, once-nomadic electrons that had roamed freely about the compound's lattice-like atomic structure—and generated their own magnetic fields—behave in a more orderly and cooperative fashion. This coherence sets the stage for superconductivity.
URu2Si2 belongs to a class of materials called heavy fermions, known to be reluctant superconductors. This is because current-carrying electrons in the intermetallic material interact with surrounding particles and truly gain from the experience. The association adds mass—making the electrons behave as though they were a few hundred times more massive than "normal." The heavy electrons once were thought to make superconductivity impossible.
However, numerous heavy fermion superconductors now are known, and URu2Si2 ranks among the most curious of the lot.
Unexplained was how a "hidden order" suddenly arose in the wake of the magnetic instabilities caused by the roving electrons, each one spinning and producing its own miniature magnetic field. With neutron probes, researchers managed to track electron movements and determined that the wandering particles work out an unexpected accommodation in the spacing of their energy levels.
Computer model predicts how fracturing metallic glass releases energy at the atomic level
20.07.2018 | American Institute of Physics
What happens when we heat the atomic lattice of a magnet all of a sudden?
18.07.2018 | Forschungsverbund Berlin
A new manufacturing technique uses a process similar to newspaper printing to form smoother and more flexible metals for making ultrafast electronic devices.
The low-cost process, developed by Purdue University researchers, combines tools already used in industry for manufacturing metals on a large scale, but uses...
For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.
To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...
For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.
Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...
Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.
A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...
Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.
"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....
13.07.2018 | Event News
12.07.2018 | Event News
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20.07.2018 | Power and Electrical Engineering
20.07.2018 | Information Technology
20.07.2018 | Materials Sciences