Journal Article Large enhancement of superconducting transition temperature in single-element superconducting rhenium by shear strain

Mito, Masaki  ,  Matsui, Hideaki  ,  Tsuruta, Kazuki  ,  Yamaguchi, Tomiko  ,  Nakamura, Kazuma  ,  Deguchi, Hiroyuki  ,  Shirakawa, Naoki  ,  Adachi, Hiroki  ,  Yamasaki, Tohru  ,  Iwaoka, Hideaki  ,  Ikoma, Yoshifumi  ,  Horita, Zenji

6p.36337 , 2016-11-04 , Nature Publishing Group
ISSN:2045-2322
Description
Finding a physical approach for increasing the superconducting transition temperature (Tc) is a challenge in the field of material science. Shear strain effects on the superconductivity of rhenium were investigated using magnetic measurements, X-ray diffraction, transmission electron microscopy, and first-principles calculations. A large shear strain reduces the grain size and simultaneously expands the unit cells, resulting in an increase in Tc. Here we show that this shear strain approach is a new method for enhancing Tc and differs from that using hydrostatic strain. The enhancement of Tc is explained by an increase in net electron–electron coupling rather than a change in the density of states near the Fermi level. The shear strain effect in rhenium could be a successful example of manipulating Bardeen–Cooper–Schrieffer-type Cooper pairing, in which the unit cell volumes are indeed a key parameter.
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