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Title: Effects of magnetic history on the ac magnetic susceptibility of granular YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} superconductors in weak fields

Abstract

We investigate the ac susceptibility of both field-cooled and zero-field-cooled sintered YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} granular thin slabs and powders in low magnetic fields. The ac susceptibility of the granular thin slabs appears to depend upon the magnetic history for dc fields larger than a certain value, {ital H}{sub dc}{sup *}, with the existence of the stronger diamagnetic signal (the in-phase part of the ac susceptibility) in the field-cooled case. Our results show that the difference in local flux distributions between the field-cooled case and the zero-field-cooled case exists even for a dc field as low as several Oe, a value much lower than the bulk lower critical field ({ital H}{sub {ital c}1}). The upper limit of a homogeneous superconducting area determined from {ital H}{sub dc}{sup *} appears comparable to the average grain size in our granular thin slabs. The existence of {ital H}{sub dc}{sup *} is attributed to the superconducting glass behavior of granular YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} with disorder in the intergranular Josephson junctions.

Authors:
 [1]; ; ;  [2];  [3]
  1. Department of Physics, Kon Kuk University, Seoul 133-701 (Korea, Republic of)
  2. Applied Physics Laboratory, Korea Institute of Science and Technology, Seoul 136-791 (Korea, Republic of)
  3. Department of Physics, Ewha Womans University, Seoul 120-750 (Korea, Republic of)
Publication Date:
OSTI Identifier:
55089
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 51; Journal Issue: 22; Other Information: PBD: 1 Jun 1995
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; HIGH-TC SUPERCONDUCTORS; MAGNETIC SUSCEPTIBILITY; COPPER OXIDES; BARIUM OXIDES; YTTRIUM OXIDES; GRANULAR MATERIALS; MAGNETIC FIELDS; MAGNETIC FLUX; JOSEPHSON JUNCTIONS

Citation Formats

Lee, S Y, Suh, M A, Bae, S M, Choi, S S, and Yang, I. Effects of magnetic history on the ac magnetic susceptibility of granular YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} superconductors in weak fields. United States: N. p., 1995. Web. doi:10.1103/PhysRevB.51.16302.
Lee, S Y, Suh, M A, Bae, S M, Choi, S S, & Yang, I. Effects of magnetic history on the ac magnetic susceptibility of granular YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} superconductors in weak fields. United States. doi:10.1103/PhysRevB.51.16302.
Lee, S Y, Suh, M A, Bae, S M, Choi, S S, and Yang, I. Thu . "Effects of magnetic history on the ac magnetic susceptibility of granular YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} superconductors in weak fields". United States. doi:10.1103/PhysRevB.51.16302.
@article{osti_55089,
title = {Effects of magnetic history on the ac magnetic susceptibility of granular YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} superconductors in weak fields},
author = {Lee, S Y and Suh, M A and Bae, S M and Choi, S S and Yang, I},
abstractNote = {We investigate the ac susceptibility of both field-cooled and zero-field-cooled sintered YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} granular thin slabs and powders in low magnetic fields. The ac susceptibility of the granular thin slabs appears to depend upon the magnetic history for dc fields larger than a certain value, {ital H}{sub dc}{sup *}, with the existence of the stronger diamagnetic signal (the in-phase part of the ac susceptibility) in the field-cooled case. Our results show that the difference in local flux distributions between the field-cooled case and the zero-field-cooled case exists even for a dc field as low as several Oe, a value much lower than the bulk lower critical field ({ital H}{sub {ital c}1}). The upper limit of a homogeneous superconducting area determined from {ital H}{sub dc}{sup *} appears comparable to the average grain size in our granular thin slabs. The existence of {ital H}{sub dc}{sup *} is attributed to the superconducting glass behavior of granular YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} with disorder in the intergranular Josephson junctions.},
doi = {10.1103/PhysRevB.51.16302},
journal = {Physical Review, B: Condensed Matter},
number = 22,
volume = 51,
place = {United States},
year = {1995},
month = {6}
}