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

22 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


  • Bulk nanostructured Nb
  • Critical current density
  • Critical temperature
  • Grain refinement
  • Magnetization
  • Resistivity


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