Non-equilibrium crystalline superconductors in Zr-Si binary alloys rapidly quenched from melts |
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Authors: | A. Inoue Y. Takahashi N. Toyota T. Fukase T. Masumoto |
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Affiliation: | (1) The Research Institute of Iron, Steel and Other Metals, Tohoku University, 980 Sendai, Japan;(2) The Graduate School, Tohoku University, 980 Sendai, Japan |
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Abstract: | The new non-equilibrium superconductor with a b c c structure has been found in rapidly quenched Zr-Si alloys. The silicon content in the b c c alloys was limited to the narrow range between 8 and 11 at%. The b c c alloys showed a superconducting transition whose temperature increased from 3.20 to 3.84 K with decreasing silicon content. The upper critical magnetic field and the critical current density for Zr92Si8 alloy were of the order of 3.58 × 106 Am–1 at 2.0 K and 3.3 × 10–2 Am–2 at 2.42 K in the absence of an applied field. The upper critical field gradient at the transition temperature and the electrical resistivity at 4.2 K were about — 1.82 × 10–1 Am–1 K–1 and about 150 cm. The Ginzburg-Landau parameter and coherence length GL (0) were estimated to be about 65 and 6.3 nm, respectively, from these experimental values by using the Ginzburg-Landau-Abrikosov-Gorkov theory and hence it is concluded that the present b c c alloys are extremely soft type-II superconductors with a high degree of dirtiness. |
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