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

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

doi:10.1016/j.physc.2013.03.046

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 journal › Article › peer-review

20 Citations (Scopus)

Abstract

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 T_c and the critical current density J_c increase. The enhancement of T_c is consistent with the size effect for nanoscale superconductors. The increase of J_c can be explained by the enhanced vortex pinning due to the introduction of lattice defects such as dislocations and grain boundaries.

Original language	English
Pages (from-to)	132-135
Number of pages	4
Journal	Physica C: Superconductivity and its applications
Volume	493
DOIs	https://doi.org/10.1016/j.physc.2013.03.046
Publication status	Published - 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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10.1016/j.physc.2013.03.046

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title = "Superconducting properties in bulk nanostructured niobium prepared by high-pressure torsion",

abstract = "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.",

author = "Terukazu Nishizaki and Seungwon Lee and Zenji Horita and Takahiko Sasaki and Norio Kobayashi",

note = "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”). ",

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doi = "10.1016/j.physc.2013.03.046",

language = "English",

volume = "493",

pages = "132--135",

journal = "Physica C: Superconductivity and its Applications",

issn = "0921-4534",

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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.

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JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

SN - 0921-4534

ER -

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

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