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Title: Dc and ac magnetic field effects in LaBaCuO/sub x/, YBa/sub 2/Cu/sub 3/O/sub 7//sub -//sub x/, and other high-T/sub c/ superconductors

Abstract

Small (<300 Oe) dc magnetic fields are found to significantly lower the superconducting transition temperature T/sub c/ and change the shape of the magnetic flux exclusion M vs T curve in powder compactions of La/sub 2//sub -//sub x/Ba/sub x/Cu/sub 3/O/sub y/, YBa/sub 2/Cu/sub 3/O/sub 7//sub -//sub x/, and other high-T/sub c/ materials. dT/sub c//dH of 0.02 to 0.08 deg/Oe with H/sub c//sub 1/ less than 20 Oe near T/sub c/ are typical. The M vs T curve and the value of H/sub c//sub 1/ are sample dependent. The results are interpreted in terms of the effect of particle size and size distribution on the material magnetic penetration depth. Measurements of the real and imaginary parts of the magnetic susceptibility show that the latter is frequency dependent over the range of 0.1--10 kHz when measured with an ac mutual inductance technique. Assuming that the material can be considered as a network of Josephson junctions, the temperature dependence of the imaginary component of the susceptibility can be used to calculate a value for the superconducting energy gap.

Authors:
;
Publication Date:
Research Org.:
Central Research and Development Department, E. I. Du Pont de Nemours and Company, Inc., Wilmington, Delaware 19898
OSTI Identifier:
6749316
Resource Type:
Journal Article
Journal Name:
J. Appl. Phys.; (United States)
Additional Journal Information:
Journal Volume: 64:10
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BARIUM OXIDES; MAGNETIC PROPERTIES; BISMUTH OXIDES; CALCIUM OXIDES; COPPER OXIDES; LANTHANUM OXIDES; STRONTIUM OXIDES; YTTRIUM OXIDES; MAGNETIC FIELDS; MAGNETIC FLUX; MAGNETIC SUSCEPTIBILITY; SUPERCONDUCTORS; TRANSITION TEMPERATURE; ULTRALOW TEMPERATURE; ALKALINE EARTH METAL COMPOUNDS; BARIUM COMPOUNDS; BISMUTH COMPOUNDS; CALCIUM COMPOUNDS; CHALCOGENIDES; COPPER COMPOUNDS; LANTHANUM COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; RARE EARTH COMPOUNDS; STRONTIUM COMPOUNDS; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS; YTTRIUM COMPOUNDS; 360204* - Ceramics, Cermets, & Refractories- Physical Properties

Citation Formats

Flippen, R B, and Askew, T R. Dc and ac magnetic field effects in LaBaCuO/sub x/, YBa/sub 2/Cu/sub 3/O/sub 7//sub -//sub x/, and other high-T/sub c/ superconductors. United States: N. p., 1988. Web. doi:10.1063/1.342198.
Flippen, R B, & Askew, T R. Dc and ac magnetic field effects in LaBaCuO/sub x/, YBa/sub 2/Cu/sub 3/O/sub 7//sub -//sub x/, and other high-T/sub c/ superconductors. United States. doi:10.1063/1.342198.
Flippen, R B, and Askew, T R. Tue . "Dc and ac magnetic field effects in LaBaCuO/sub x/, YBa/sub 2/Cu/sub 3/O/sub 7//sub -//sub x/, and other high-T/sub c/ superconductors". United States. doi:10.1063/1.342198.
@article{osti_6749316,
title = {Dc and ac magnetic field effects in LaBaCuO/sub x/, YBa/sub 2/Cu/sub 3/O/sub 7//sub -//sub x/, and other high-T/sub c/ superconductors},
author = {Flippen, R B and Askew, T R},
abstractNote = {Small (<300 Oe) dc magnetic fields are found to significantly lower the superconducting transition temperature T/sub c/ and change the shape of the magnetic flux exclusion M vs T curve in powder compactions of La/sub 2//sub -//sub x/Ba/sub x/Cu/sub 3/O/sub y/, YBa/sub 2/Cu/sub 3/O/sub 7//sub -//sub x/, and other high-T/sub c/ materials. dT/sub c//dH of 0.02 to 0.08 deg/Oe with H/sub c//sub 1/ less than 20 Oe near T/sub c/ are typical. The M vs T curve and the value of H/sub c//sub 1/ are sample dependent. The results are interpreted in terms of the effect of particle size and size distribution on the material magnetic penetration depth. Measurements of the real and imaginary parts of the magnetic susceptibility show that the latter is frequency dependent over the range of 0.1--10 kHz when measured with an ac mutual inductance technique. Assuming that the material can be considered as a network of Josephson junctions, the temperature dependence of the imaginary component of the susceptibility can be used to calculate a value for the superconducting energy gap.},
doi = {10.1063/1.342198},
journal = {J. Appl. Phys.; (United States)},
number = ,
volume = 64:10,
place = {United States},
year = {1988},
month = {11}
}