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Critical currents in polycrystalline Y Ba{sub 2}Cu{sub 3}O{sub 7-x}: Self-field and grain size dependence

Technical Report:

Abstract

The variation of critical currents (I{sub c}) and their distributions (CCD) with thickness (t) has been investigated for two high quality YBa{sub 2}Cu{sub 3}O{sub 7-x} samples with different average grain size (AG{approx_equal}10 and 30 {mu}m for samples S{sub 1} and S{sub 2} respectively) in the temperature range 78-90K and in the applied magnetic field H<50 0e. The critical current density (J{sub c}) for S{sub 1} initially increased but later on leveled off on reducing the thickness, whereas for S{sub 2} remained essentially unchanged even after three-fold reduction in thickness. Since the other parameters related to macroscopic homogeneity have not changed on reducing the thickness of the samples, the variations of J{sub c} are interpreted in terms of thickness and grain size dependent self-field effects. The same model explains well the changes of CCD curves with thickness and may also explain the variation of J{sub c} with the grain size, as reported recently for ceramic YBaCuO samples. (author). 18 refs, 7 figs, 2 tabs.
Authors:
Babic, E; Prester, M; Dobrac, D; Marohnic, Z; [1]  Bernik, S; [2]  Nazar, P; Stastny, P; Matacotta, F C
  1. Zagreb Univ., Zagreb (Yugoslavia). Inst. of Physics
  2. Institut Jozef Stefan, Ljubljana (Yugoslavia)
Publication Date:
Oct 01, 1991
Product Type:
Technical Report
Report Number:
IC-91/345
Reference Number:
SCA: 665411; 360207; PA: AIX-23:018442; SN: 92000662050
Resource Relation:
Other Information: PBD: Oct 1991
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; HIGH-TC SUPERCONDUCTORS; CRITICAL CURRENT; BARIUM OXIDES; CERAMICS; COPPER OXIDES; EXPERIMENTAL DATA; GRAIN SIZE; MAGNETIC FIELDS; TEMPERATURE DEPENDENCE; YTTRIUM OXIDES; 665411; 360207; BASIC SUPERCONDUCTIVITY STUDIES
OSTI ID:
10118660
Research Organizations:
International Centre for Theoretical Physics (ICTP), Trieste (Italy)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ON: DE92617540; TRN: XA9230514018442
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
INIS
Size:
31 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Babic, E, Prester, M, Dobrac, D, Marohnic, Z, Bernik, S, Nazar, P, Stastny, P, and Matacotta, F C. Critical currents in polycrystalline Y Ba{sub 2}Cu{sub 3}O{sub 7-x}: Self-field and grain size dependence. IAEA: N. p., 1991. Web.
Babic, E, Prester, M, Dobrac, D, Marohnic, Z, Bernik, S, Nazar, P, Stastny, P, & Matacotta, F C. Critical currents in polycrystalline Y Ba{sub 2}Cu{sub 3}O{sub 7-x}: Self-field and grain size dependence. IAEA.
Babic, E, Prester, M, Dobrac, D, Marohnic, Z, Bernik, S, Nazar, P, Stastny, P, and Matacotta, F C. 1991. "Critical currents in polycrystalline Y Ba{sub 2}Cu{sub 3}O{sub 7-x}: Self-field and grain size dependence." IAEA.
@misc{etde_10118660,
title = {Critical currents in polycrystalline Y Ba{sub 2}Cu{sub 3}O{sub 7-x}: Self-field and grain size dependence}
author = {Babic, E, Prester, M, Dobrac, D, Marohnic, Z, Bernik, S, Nazar, P, Stastny, P, and Matacotta, F C}
abstractNote = {The variation of critical currents (I{sub c}) and their distributions (CCD) with thickness (t) has been investigated for two high quality YBa{sub 2}Cu{sub 3}O{sub 7-x} samples with different average grain size (AG{approx_equal}10 and 30 {mu}m for samples S{sub 1} and S{sub 2} respectively) in the temperature range 78-90K and in the applied magnetic field H<50 0e. The critical current density (J{sub c}) for S{sub 1} initially increased but later on leveled off on reducing the thickness, whereas for S{sub 2} remained essentially unchanged even after three-fold reduction in thickness. Since the other parameters related to macroscopic homogeneity have not changed on reducing the thickness of the samples, the variations of J{sub c} are interpreted in terms of thickness and grain size dependent self-field effects. The same model explains well the changes of CCD curves with thickness and may also explain the variation of J{sub c} with the grain size, as reported recently for ceramic YBaCuO samples. (author). 18 refs, 7 figs, 2 tabs.}
place = {IAEA}
year = {1991}
month = {Oct}
}