Journal
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
Volume 460, Issue -, Pages 182-185Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physc.2007.03.025
Keywords
superconductivity; high pressure
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High pressure studies have played an important role in the field of superconductivity since the first experiments by Sizoo and Onnes in Leiden in 1925. A rapid dependence of the transition temperature on pressure signals that the material is capable of higher values of T-c at ambient pressure. Significant extensions of the pressure range, most recently to pressures above 1 Mbar using the diamond-anvil cell, have resulted in the discovery of many new superconductors. The transition temperature of Y metal has very recently been pushed by 1.15 Mbar pressure to 20 K, a value for an elemental superconductor second only to that of Ca at Mbar pressures. Such enormous pressures are even sufficient to destroy the free-electron character of the conduction electrons in the alkali metals. Selected experiments are discussed which illustrate these features. (c) 2007 Elsevier B.V. All rights reserved.
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