Magnetocaloric Effect and the Upper Critical Field of Superconducting Niobium

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概要

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• The reversible magnetocaloric effect observed in the mixed state of a high purity niobium single crystal is shown to yield precise values of the upper critical field H_<c2> corresponding to a second order phase transition together with other properties of the mixed state. Measurements of H_<c2> from about 0.3°K to T_c = 9.23°K are reported. Extrapolation to 0°K gives H_<c2> = 4035Oe, whereas precise measurements near T_c gives for the initial slope, -(dH_<c2>/dT)_T = T_c = 531Oe/°K. Analysis of the results in terms of microscopic theory shows that reported disagreements pertaining to H_<c2>(0) may be accounted for by deviations of the quantities related to the superconducting ground state from BCS laws. Brief accounts of the Ginzburg-Landau-Maki parameter κ_2 derived from magnetocaloric measurements and results obtained on a deformed crystal are given.

• 社団法人日本物理学会の論文
• 1967-11-05

著者

• Ohtsuka Taiichiro

  Institute For Solid State Physics University Of Tokyo

• TAKANO Nobuyoshi

  Institute for Solid State Physics, University of Tokyo

• Takano Nobuyoshi

  Institute For Solid State Physics University Of Tokyo

関連論文

• The Magnetic Properties and their Temperature Dependence of Ferromagnetic Alloys with an Order-disorder Transformation. I. Ni_3Fe
• Magnetocaloric Effect and the Upper Critical Field of Superconducting Niobium
• Non-Magnetic Localized State in Aluminum. : II. Specific Heat and Magnetic Susceptibility
• The Magnetic Properties and their Temperature Dependence of Ferromagnetic Alloys with an Order-disorder Tsansformation. II Ni_3Mn

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