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

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

    Research output: Contribution to journalArticlepeer-review

    19 Citations (Scopus)

    Abstract

    Finding a physical approach for increasing the superconducting transition temperature (T c) 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 T c. Here we show that this shear strain approach is a new method for enhancing T c and differs from that using hydrostatic strain. The enhancement of T c 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.

    Original languageEnglish
    Article number36337
    JournalScientific reports
    Volume6
    DOIs
    Publication statusPublished - Nov 4 2016

    All Science Journal Classification (ASJC) codes

    • General

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