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Title: Resistance anomaly in disordered superconducting films.

Abstract

The authors report on a resistance anomaly in disordered superconducting films containing arrays of irregularly distributed nanoscale holes. At high driving currents, peaks appear in the resistance as a function of temperature, with peak values up to 2% above the classic normal-state resistance. The authors attribute the observed resistance anomaly to dissipation-induced granularity which enhances the contributions from fluctuation-induced reduction of the density of states of the quasiparticles. The granular feature of a disordered superconducting film originates from the inhomogeneous temperature distribution caused by the variation of the local dissipation and/or heat transfer.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF)
OSTI Identifier:
948797
Report Number(s):
ANL/MSD/JA-58576
Journal ID: ISSN 0003-6951; APPLAB; TRN: US200907%%201
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Appl. Phys. Lett.; Journal Volume: 90; Journal Issue: 7 ; 2007
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; ELECTRIC CONDUCTIVITY; SUPERCONDUCTING FILMS; ORDER PARAMETERS; HOLES

Citation Formats

Hua, J., Xiao, Z. L., Rosenmann, D., Beloborodov, I., Welp, U., Kwok, W. K., Crabtree, G. W., Materials Science Division, and Northern Illinois Univ.. Resistance anomaly in disordered superconducting films.. United States: N. p., 2007. Web. doi:10.1063/1.2680068.
Hua, J., Xiao, Z. L., Rosenmann, D., Beloborodov, I., Welp, U., Kwok, W. K., Crabtree, G. W., Materials Science Division, & Northern Illinois Univ.. Resistance anomaly in disordered superconducting films.. United States. doi:10.1063/1.2680068.
Hua, J., Xiao, Z. L., Rosenmann, D., Beloborodov, I., Welp, U., Kwok, W. K., Crabtree, G. W., Materials Science Division, and Northern Illinois Univ.. Mon . "Resistance anomaly in disordered superconducting films.". United States. doi:10.1063/1.2680068.
@article{osti_948797,
title = {Resistance anomaly in disordered superconducting films.},
author = {Hua, J. and Xiao, Z. L. and Rosenmann, D. and Beloborodov, I. and Welp, U. and Kwok, W. K. and Crabtree, G. W. and Materials Science Division and Northern Illinois Univ.},
abstractNote = {The authors report on a resistance anomaly in disordered superconducting films containing arrays of irregularly distributed nanoscale holes. At high driving currents, peaks appear in the resistance as a function of temperature, with peak values up to 2% above the classic normal-state resistance. The authors attribute the observed resistance anomaly to dissipation-induced granularity which enhances the contributions from fluctuation-induced reduction of the density of states of the quasiparticles. The granular feature of a disordered superconducting film originates from the inhomogeneous temperature distribution caused by the variation of the local dissipation and/or heat transfer.},
doi = {10.1063/1.2680068},
journal = {Appl. Phys. Lett.},
number = 7 ; 2007,
volume = 90,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}
  • In disordered superconducting Cu-Zr alloys with dilute magnetic impurities, we have observed a new type of resistance anomaly which gives rise to strongly increased scattering of conduction electrons in a narrow temperature range above {ital T}{sub {ital c}} and appears to be due to interaction between superconducting fluctuations and spin. For a given level of impurities this phenomenon is peaked around Cu{sub 50}Zr{sub 50}, but is observable from 36 to 60 at.% Zr. When the Cr impurity concentration is varied in Cu{sub 50}Zr{sub 50}, a resistance peak can be observed for 100--600 ppm Cr with a maximum peak height ofmore » about 6% of the measured resistance. The effect is destroyed by a magnetic field of some tenths of a tesla.« less
  • Gaplessness was observed in the disordered films of MoC close to the superconductor to insulator transition. The transition temperature decreases and the superconducting gap tends to close as the film thickness is reduced to 3 nm from 20 nm. The gaplessness is attributed to the enhanced Coulomb interactions due to the loss of screening in the presence of strong disorder in the films.
  • We have investigated the bias-voltage dependence of the phase-dependent differential resistance of a disordered T-shaped two-dimensional electron gas coupled to two superconducting terminals. The resistance oscillations first increase upon lowering the energy. For bias voltages below the Thouless energy, the resistance oscillations are suppressed and disappear almost completely at zero bias voltage. We find a qualitative agreement with the calculated reentrant behavior of the resistance and discuss quantitative deviations. {copyright} {ital 1997} {ital The American Physical Society}
  • Disordered films of superconductors above their transition temperature T/sub c/ show several quantum corrections to the conductance, weak localization (WL), two contributions from the retarded Coulomb interaction, and two contributions from superconducting fluctuations, the Aslamazov-Larkin (AL) and the Maki-Thompson (MT) terms. In a magnetic field, most of them show a magnetoresistance and all are temperature dependent. In this paper the temperature and field dependence of the resistance is measured for Al, Sn, and amorphous Bi/sub 0.9/Tl/sub 0.1/ films. This covers the weak-coupling and the extremely-strong-coupling superconductors as well. Of particular interest are the AL and the MT terms. The lattermore » can be reduced by a pair-breaking mechanism. This pair breaking is caused by the inelastic-scattering time of the conduction electrons and can be measured by weak localization. Al has only a small spin-orbit scattering but by covering it with (1/4) atomic layer of Au it can be transformed into a strong spin-orbit scatterer. This allows an independent determination of the inelastic lifetime tau/sub i/ and spin-orbit scattering time tau/sub s.o./ and therefore a complete examination of the theory and its consistency. The agreement between experiment and theory is very good for the magnetoresistance. However, the theory for the temperature dependence of the resistance fails (with the exception of the contribution of WL). For the intermediate- and strong-coupling superconductors the applicability of the existing theories is restricted. The magnetoresistance of amorphous Bi/sub 0.9/Tl/sub 0.1/ is essentially determined by the AL contribution.« less