Magnetic Properties of Superconducting Niobium-Tantalum Alloys

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概要

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• The superconducting transition temperature and isothermal magnetization have been measured for a series of Nb-Ta alloys ranging from Nb-13 at. % Ta to Nb-83 at. % Ta. These alloys are characterized as dirty type II superconductors; the electron mean free path l lies in a range from 0.1ξ_0 to 0.3ξ_0, where ξ_0 is the intrinsic coherence length. The Ginzburg-Landau parameter κ takes the maximum value of 4.1 at the composition, Nb-50 at. % Ta. In concentrated alloys with compositions 20∼80 at. % Ta, the temperature dependence of the generalized Ginzburg-Landau parameter κ_1(T) accords with the theory for the dirty limit. Especially, the reduced parameter at 0°K, κ_1(0)/κ, is in excellent agreement with the theoretical value 1.20. This agreement between experiment and theory is attributed to the fact that the temperature dependence of both the thermodynamic critical field H_c(T) and the upper critical field H_<c2>(T) follows the microscopic theory.

• 社団法人日本物理学会の論文
• 1968-12-05

著者

• Ogasawara Takeshi

  Department Of Physics College Of Science And Engineering Nihon University

• Yasukochi Ko

  Department Of Physics And Atomic Energy Research Institute College Of Science And Engineering Nihon

• Ogasawara Takeshi

  Department Of Biotechnology Faculty Of Technology Tokyo University Of Agriculture And Technology

• KUBOTA Yoji

  Department of Physics, College of Science and Engineering Nihon University

• Kubota Yoji

  Department Of Physics College Of Science And Engineering Nihon University

• Kubota Yoji

  Department Of Chemistry Kyushu University

• YASUKOCHI Ko

  Department of Physics, College of Science and Engineering Nihon University

• Ogasawara Takeshi

  Department of Physics, College of Science and Engineering Nihon University

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