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Superconductivity of Elemental Metals under Ultra-High Pressure

Superconductivity of Elemental Metals under Ultra-High Pressure James S. Schilling, Washington University, DMR 0404505.

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Superconductivity of Elemental Metals under Ultra-High Pressure

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  1. Superconductivity of Elemental Metals under Ultra-High Pressure James S. Schilling, Washington University,DMR 0404505 Of the 52 known elemental superconductors, 22 only become superconducting if high pressures are applied: Y, Sc and Lu are three examples. The figure shows that at 1.15 Megabar (17 million psi), the superconducting transition temperature of Y rises to 20 K, the second highest value observed for any elemental superconductor. Also seen is our very recent result that Tc of Lu reaches 11 K at 2.2 Megabar (32 million psi), the second highest pressure at which a superconducting transition has ever been detected. Higher pressures are likely to lead to further increases in Tc. The study of systematic trends in the superconducting behaviour of elements at high pressure contributes to a greater understanding of the conditions necessary to push superconductivity to higher temperatures. Left: A sample of yttrium compressed between diamond anvils to a pressure of 115 GPa (17 million psi). Above: Dependence of superconducting transition temperatures of Y, Sc, and Lu on pressure to 220 GPa (32 million psi).

  2. Superconductivity of Elemental Metals under Ultra-High Pressure James S. Schilling, Washington University,DMR 0404505 Education: This work was carried out by graduate student James Hamlin as part of his Ph.D. research with additional experiments performed by Japanese graduate student Takahiro Matsuoka while he was a guest of our group. Our group website: http://wuphys.wustl.edu/~jss/ contains full information on the past and current research activities of our group, including the latest preprints, as well as a description of the major research facilities available. Societal Impact: To date, superconductors have played only a minor role in modern technology. Using high pressures to create new superconductors and to raise Tc to higher values helps us to better understand the superconducting state and thus puts us in a position to develop superior superconducting materials with potential applications.

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