TY - JOUR
T1 - Superconducting properties in bulk nanostructured niobium prepared by high-pressure torsion
AU - Nishizaki, Terukazu
AU - Lee, Seungwon
AU - Horita, Zenji
AU - Sasaki, Takahiko
AU - Kobayashi, Norio
N1 - Funding Information:
We thank M. Kato, T. Ishida, B. Shinozaki, N. Kokubo, and T. Nojima for fruitful discussions. This work was partly supported by a MEXT KAKENHI (Grant-in-Aid for Scientific Research on Innovative Areas “Bulk Nanostructured Metals”).
PY - 2013
Y1 - 2013
N2 - 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.
AB - 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.
KW - Bulk nanostructured Nb
KW - Critical current density
KW - Critical temperature
KW - Grain refinement
KW - Magnetization
KW - Resistivity
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U2 - 10.1016/j.physc.2013.03.046
DO - 10.1016/j.physc.2013.03.046
M3 - Article
AN - SCOPUS:84885478884
SN - 0921-4534
VL - 493
SP - 132
EP - 135
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
ER -