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Upper Critical Field of Superconducting Amorphous Alloy Zr_<85>Si_<15>

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The upper critical field H_<c2> is measured for the amorphous superconductor Zr_<85>Si_<15> (T_c=2.70 K, ρ_n=270 μΩ・cm) in the wide temperature range down to 50 mK. The conventional V-H recording in sweeping magnetic field and measurements of the flux flow resistivity defined by the I-V curve at constant field are done in order to clarify the resistive transition of the superconducting mixed-to-normal state in an amorphous superconductor with extreme softness in the flux pinning interaction. The results show the strong suppression of H_<c2> at low temperatures, which is quite different from the upward deviation from the theoretical values H_<c2>^* due to the orbital pair breaking effect in the dirty limit, reported for some amorphous alloys. Analysis with the Werthamer-Helfand-Hohenberg theory which takes into account the effects of the orbital pair breaking, spin paramagnetism and spin-orbit interaction gives 1.51≤α≤1.77 and 1.0≤λ_<so>≤1.7, where α is the impurity parameter and λ_<so> the spin orbit interaction parameter. This is the first implication for the superconductivity in amorphous alloys that the spin paramagnetic effect plays an important role in determining the low temperature H_<c2> and the spin-orbit (spin-flip) scattering enhances H_<c2> moderately. The counterevidence is produced to the previous observation that the upward deviation anomaly (H_<c2>>H_<c2>^*) is an intrinsic property in amorphous metals with high resitivity.

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