Neutron probe yields break in superconductor mystery

Call it a break in the case of “hidden order and the unconventional superconductor.” Writing in the journal Nature Physics,* U.S. and Canadian researchers report a major step toward solving a two-decades-old materials science mystery and progress toward the ultimate goal of engineering materials optimized for magnetic and electric properties.

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.

From NIST

1 thought on “Neutron probe yields break in superconductor mystery”

  1. In 55 million years ago, the Moon had hited the Earth, hited in today PacificOcean’s position, the Moon dislodges a big pit on the Earth, that wasthe Pacific basin On the original Earth everywhere is the water, theEarth to the surface all by the water cover, afterwards, the Moon hitthe Earth, on Earth’s water all flowed in Pacific Ocean that gulf togo, thereupon has formed the Pacific Ocean, Because the Moon hit the Earth to have the prehistoric ??, as wellas the biology greatly exterminated Surplus survives the animal hashad the different change.
    Some people asked me, “How do you are discover another Earth?” I said that, “WhenI 20 year-old ,I elopes with her, then led her to goto a nobody island, was defending her, as soon as defended is 18 years, the wind frost and snow rain has not ever broken faith.
    Chen Xiaobin introduces: I study the Earth already for 18 years, neverhas an appropriate work, the unemployment, the unemployment, or isunemployed, 40 year-old person, the house did not have, the work doesnot have, but also frequently hungry belly

    TEL:0971-5217197 FAX:0971-5217308

Leave a Comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Get more stuff like this
in your inbox

From anti-aging to the search for alien life, we promise to never bore.