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Percolation effects in the V - I characteristics of granular YBa{sub 2}Cu{sub 3}O{sub 7-{delta}}

Technical Report:

Abstract

V - I characteristics of granular YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} samples with very different grain size and thickness have been studied in the temperature range 65 - 85K and magnetic fields up to 35 Oe. The results present clear evidence of percolation effects in a 3D network of weakly linked superconducting grains. The onset of dissipation follows a V is proportional to (I - I{sub c}){sup n} power law n assumes values between 2 and 2.6 and does not depend on microstructure or thickness. It shows a very weak dependence, if any, on the external magnetic field, H, and temperature, T. This suggests that the shape of the low current side of the distribution of critical currents of the links is also quite insensitive to H and T. It also shows that the transition to the coherent state takes place at T>85K. Peculiar percolation effects have been observed when the thickness of the sample approaches the grain size. V is proportional to (I - I{sub c}){sup n} onsets of dissipation with exponent n practically the same as in other granular superconductors (both conventional and high temperature ones) present clear evidence for the percolation effects in 3D network of intergrain links.  More>>
Authors:
Babic, E; Prester, M; Babic, D; [1]  Nozar, P; Stastny, P; Matacotta, F C
  1. Zagreb Univ., Zagreb (Yugoslavia). Inst. of Physics
Publication Date:
Oct 01, 1991
Product Type:
Technical Report
Report Number:
IC-91/346
Reference Number:
SCA: 665411; 360207; PA: AIX-23:018443; SN: 92000662051
Resource Relation:
Other Information: PBD: Oct 1991
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; HIGH-TC SUPERCONDUCTORS; ELECTRIC CONDUCTIVITY; BARIUM OXIDES; CERAMICS; COPPER OXIDES; GRAIN SIZE; MAGNETIC FIELDS; TEMPERATURE DEPENDENCE; YTTRIUM OXIDES; 665411; 360207; BASIC SUPERCONDUCTIVITY STUDIES
OSTI ID:
10118662
Research Organizations:
International Centre for Theoretical Physics (ICTP), Trieste (Italy)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ON: DE92617541; TRN: XA9230515018443
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
INIS
Size:
12 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Babic, E, Prester, M, Babic, D, Nozar, P, Stastny, P, and Matacotta, F C. Percolation effects in the V - I characteristics of granular YBa{sub 2}Cu{sub 3}O{sub 7-{delta}}. IAEA: N. p., 1991. Web.
Babic, E, Prester, M, Babic, D, Nozar, P, Stastny, P, & Matacotta, F C. Percolation effects in the V - I characteristics of granular YBa{sub 2}Cu{sub 3}O{sub 7-{delta}}. IAEA.
Babic, E, Prester, M, Babic, D, Nozar, P, Stastny, P, and Matacotta, F C. 1991. "Percolation effects in the V - I characteristics of granular YBa{sub 2}Cu{sub 3}O{sub 7-{delta}}." IAEA.
@misc{etde_10118662,
title = {Percolation effects in the V - I characteristics of granular YBa{sub 2}Cu{sub 3}O{sub 7-{delta}}}
author = {Babic, E, Prester, M, Babic, D, Nozar, P, Stastny, P, and Matacotta, F C}
abstractNote = {V - I characteristics of granular YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} samples with very different grain size and thickness have been studied in the temperature range 65 - 85K and magnetic fields up to 35 Oe. The results present clear evidence of percolation effects in a 3D network of weakly linked superconducting grains. The onset of dissipation follows a V is proportional to (I - I{sub c}){sup n} power law n assumes values between 2 and 2.6 and does not depend on microstructure or thickness. It shows a very weak dependence, if any, on the external magnetic field, H, and temperature, T. This suggests that the shape of the low current side of the distribution of critical currents of the links is also quite insensitive to H and T. It also shows that the transition to the coherent state takes place at T>85K. Peculiar percolation effects have been observed when the thickness of the sample approaches the grain size. V is proportional to (I - I{sub c}){sup n} onsets of dissipation with exponent n practically the same as in other granular superconductors (both conventional and high temperature ones) present clear evidence for the percolation effects in 3D network of intergrain links. (author). 15 refs, 3 figs, 1 tab.}
place = {IAEA}
year = {1991}
month = {Oct}
}