Superconducting properties in bulk nanostructured niobium prepared by high-pressure torsion

Terukazu Nishizaki, Seungwon Lee, Zenji Horita, Takahiko Sasaki, Norio Kobayashi

    Research output: Contribution to journalArticlepeer-review

    23 Citations (Scopus)


    We have measured the magnetization M(T, H) and the resistivity p(T) in bulk nanostructured Nb prepared by high-pressure torsion (HPT) and studied the effect of the grain refinement on the superconducting properties. With increasing revolution numbers N of HPT, the critical temperature Tc and the critical current density Jc increase. The enhancement of Tc is consistent with the size effect for nanoscale superconductors. The increase of Jc can be explained by the enhanced vortex pinning due to the introduction of lattice defects such as dislocations and grain boundaries.

    Original languageEnglish
    Pages (from-to)132-135
    Number of pages4
    JournalPhysica C: Superconductivity and its applications
    Publication statusPublished - 2013

    All Science Journal Classification (ASJC) codes

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Energy Engineering and Power Technology
    • Electrical and Electronic Engineering


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