Critical Temperature in Bulk Ultrafine-Grained Superconductors of Nb, V, and Ta Processed by High-Pressure Torsion

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  • Nishizaki Terukazu
    Department of Electrical Engineering, Kyushu Sangyo University
  • Edalati Kaveh
    WPI, International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University
  • Lee Seungwon
    Department of Materials Design and Engineering, University of Toyama
  • Horita Zenji
    WPI, International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University
  • Akune Tadahiro
    Department of Electrical Engineering, Kyushu Sangyo University
  • Nojima Tsutomu
    Institute for Materials Research, Tohoku University
  • Iguchi Satoshi
    Institute for Materials Research, Tohoku University
  • Sasaki Takahiko
    Institute for Materials Research, Tohoku University

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<p>This overview describes the progressive results of the superconducting critical temperature in bulk nanostructured metals (niobium, vanadium and tantalum) processed by high-pressure torsion (HPT). Bulk nanostructured superconductors provide a new route to control superconducting property, because ultrafine-grain structures with a high density of grain boundaries, dislocations, and other crystalline defects modify the superconducting order parameter. The critical temperature Tc in Nb increases with the evolution of grain refinement owing to the quantum confinement of electrons in ultrafine grains. In V and Ta, however, Tc decreases at a certain HPT revolution number (i.e. at certain strain levels). The different behaviour of Tc in the three materials is explained by the competition effect between the quantum size effect and disorder effect; these effects are characterized by the parameters of grain size, electron mean free path, and superconducting coherence length.</p>

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  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 60 (7), 1367-1376, 2019-07-01

    公益社団法人 日本金属学会

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