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Title: Upper critical field and related properties of superconducting amorphous alloys Zr--Si

Abstract

The upper critical field H/sub c/2 has been measured for the superconducting amorphous alloys Zr/sub 100-x/Si/sub x/ with x = 13, 15, and 17 over a wide temperature range down to 50 mK. Measurements for related properties, such as the depinning current density J/sub p/, pinning force density F/sub p/, and flux flow resistivity rho/sub f/, reveal that these systems are well characterized as typically soft and dirty type II superconductors with an extremely low J/sub p/ of 1 A/cm/sup 2/ and F/sub p/ of 1.5 x 10/sup 4/ N/m/sup 3/ at h(equivalentH/H/sub c2/) = 0.5 and t(equivalentT/T/sub c/) = 0.5. The temperature dependence of H/sub c2/ is well fitted by a curve of the Werthamer-Helfand-Hohenberg theory with Maki parameter ..cap alpha.. = 1.7--1.5 and spin-orbit interaction parameter lambda/sub so/ = 1--2.4. These results indicate that the Pauli spin-paramagnetic effect plays an important role in the low-temperature behavior of H/sub c2/ in these low-T/sub c/ and high-H/sub c2/ amorphous superconductors. Corrections of the electron-phonon coupling (lambda/sub ep/ = 0.6) to the Pauli spin-paramagnetic limiting field lead to a reduced importance of the spin-orbit interaction effect, with lambda/sub so/ less than 1.0 A discussion is given of the structural inhomogeneities inmore » an amorphous phase, which are sensitively reflected in the strength of the fluxoid line pinning interaction (J/sub p/, F/sub p/) and are intimately related to the nonintrinsic anomaly, observed in many amorphous alloys, that H/sub c2/ values.« less

Authors:
; ; ;
Publication Date:
Research Org.:
The Research Institute for Iron, Steel and Other Metals, Tohoku University, Sendai, Japan
OSTI Identifier:
6694765
Resource Type:
Journal Article
Journal Name:
J. Low Temp. Phys.; (United States)
Additional Journal Information:
Journal Volume: 55:5
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; SILICON ALLOYS; CRITICAL FIELD; ZIRCONIUM BASE ALLOYS; AMORPHOUS STATE; CURRENT DENSITY; ELECTRON-PHONON COUPLING; EXPERIMENTAL DATA; MAGNETIC FLUX; SUPERCONDUCTIVITY; TEMPERATURE DEPENDENCE; ULTRALOW TEMPERATURE; ALLOYS; DATA; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; INFORMATION; MAGNETIC FIELDS; NUMERICAL DATA; PHYSICAL PROPERTIES; ZIRCONIUM ALLOYS; 360104* - Metals & Alloys- Physical Properties; 656102 - Solid State Physics- Superconductivity- Acoustic, Electronic, Magnetic, Optical, & Thermal Phenomena- (-1987)

Citation Formats

Toyota, N, Inoue, A, Fukase, T, and Masumoto, T. Upper critical field and related properties of superconducting amorphous alloys Zr--Si. United States: N. p., 1984. Web. doi:10.1007/BF00681771.
Toyota, N, Inoue, A, Fukase, T, & Masumoto, T. Upper critical field and related properties of superconducting amorphous alloys Zr--Si. United States. https://doi.org/10.1007/BF00681771
Toyota, N, Inoue, A, Fukase, T, and Masumoto, T. Fri . "Upper critical field and related properties of superconducting amorphous alloys Zr--Si". United States. https://doi.org/10.1007/BF00681771.
@article{osti_6694765,
title = {Upper critical field and related properties of superconducting amorphous alloys Zr--Si},
author = {Toyota, N and Inoue, A and Fukase, T and Masumoto, T},
abstractNote = {The upper critical field H/sub c/2 has been measured for the superconducting amorphous alloys Zr/sub 100-x/Si/sub x/ with x = 13, 15, and 17 over a wide temperature range down to 50 mK. Measurements for related properties, such as the depinning current density J/sub p/, pinning force density F/sub p/, and flux flow resistivity rho/sub f/, reveal that these systems are well characterized as typically soft and dirty type II superconductors with an extremely low J/sub p/ of 1 A/cm/sup 2/ and F/sub p/ of 1.5 x 10/sup 4/ N/m/sup 3/ at h(equivalentH/H/sub c2/) = 0.5 and t(equivalentT/T/sub c/) = 0.5. The temperature dependence of H/sub c2/ is well fitted by a curve of the Werthamer-Helfand-Hohenberg theory with Maki parameter ..cap alpha.. = 1.7--1.5 and spin-orbit interaction parameter lambda/sub so/ = 1--2.4. These results indicate that the Pauli spin-paramagnetic effect plays an important role in the low-temperature behavior of H/sub c2/ in these low-T/sub c/ and high-H/sub c2/ amorphous superconductors. Corrections of the electron-phonon coupling (lambda/sub ep/ = 0.6) to the Pauli spin-paramagnetic limiting field lead to a reduced importance of the spin-orbit interaction effect, with lambda/sub so/ less than 1.0 A discussion is given of the structural inhomogeneities in an amorphous phase, which are sensitively reflected in the strength of the fluxoid line pinning interaction (J/sub p/, F/sub p/) and are intimately related to the nonintrinsic anomaly, observed in many amorphous alloys, that H/sub c2/ values.},
doi = {10.1007/BF00681771},
url = {https://www.osti.gov/biblio/6694765}, journal = {J. Low Temp. Phys.; (United States)},
number = ,
volume = 55:5,
place = {United States},
year = {1984},
month = {6}
}