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Title: Dissipation in high-temperature superconductors in a magnetic field

Abstract

The absence of a Lorentz force dependence on dissipation in the highly anisotropic highly high-temperature superconductor, Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub x}, has been measured over a wide range of current densities in broadened resistive transitions, current-voltage characteristics, magnetoresistances, and critical current densities, J{sub c}. The magnetoresistances are very useful to find out the correct temperature and field dependences of the activation energy. As an alternative to flux motion, we consider a Josephson-coupling model which is consistent with the broadened resistive transitions and the lack of Lorentz-force dependence. We found that the Josephson-coupling model agrees with the temperature dependences of the activation energy and J{sub c} and is better matched to the weak field dependence of J{sub c} than the flux creep model. Possible origins of Josephson junctions in high-quality films and single crystals are discussed. 12 refs., 6 figs.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab., IL (USA)
Sponsoring Org.:
DOE/ER; National Science Foundation (NSF)
OSTI Identifier:
6334600
Report Number(s):
CONF-900944-32
ON: DE91006596; CNN: STC-8809854
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: Applied superconductivity conference, Aspen, CO (USA), 24-28 Sep 1990
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BARIUM OXIDES; MAGNETORESISTANCE; CALCIUM OXIDES; COPPER OXIDES; HIGH-TC SUPERCONDUCTORS; ENERGY LOSSES; THALLIUM OXIDES; CURRENT DENSITY; ELECTRIC CONDUCTIVITY; LORENTZ FORCE; MAGNETIC FIELDS; SAMPLE PREPARATION; ALKALINE EARTH METAL COMPOUNDS; BARIUM COMPOUNDS; CALCIUM COMPOUNDS; CHALCOGENIDES; COPPER COMPOUNDS; ELECTRICAL PROPERTIES; LOSSES; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; SUPERCONDUCTORS; THALLIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; 360204* - Ceramics, Cermets, & Refractories- Physical Properties; 656100 - Condensed Matter Physics- Superconductivity

Citation Formats

Kim, D H, Gray, K E, Kampwirth, R T, McDonald, D B, and McKay, D M. Dissipation in high-temperature superconductors in a magnetic field. United States: N. p., 1990. Web.
Kim, D H, Gray, K E, Kampwirth, R T, McDonald, D B, & McKay, D M. Dissipation in high-temperature superconductors in a magnetic field. United States.
Kim, D H, Gray, K E, Kampwirth, R T, McDonald, D B, and McKay, D M. Mon . "Dissipation in high-temperature superconductors in a magnetic field". United States. https://www.osti.gov/servlets/purl/6334600.
@article{osti_6334600,
title = {Dissipation in high-temperature superconductors in a magnetic field},
author = {Kim, D H and Gray, K E and Kampwirth, R T and McDonald, D B and McKay, D M},
abstractNote = {The absence of a Lorentz force dependence on dissipation in the highly anisotropic highly high-temperature superconductor, Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub x}, has been measured over a wide range of current densities in broadened resistive transitions, current-voltage characteristics, magnetoresistances, and critical current densities, J{sub c}. The magnetoresistances are very useful to find out the correct temperature and field dependences of the activation energy. As an alternative to flux motion, we consider a Josephson-coupling model which is consistent with the broadened resistive transitions and the lack of Lorentz-force dependence. We found that the Josephson-coupling model agrees with the temperature dependences of the activation energy and J{sub c} and is better matched to the weak field dependence of J{sub c} than the flux creep model. Possible origins of Josephson junctions in high-quality films and single crystals are discussed. 12 refs., 6 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1990},
month = {1}
}

Conference:
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