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Author Pomar, A. ♦ Curras, S. R. ♦ Veira, J. A. ♦ Vidal, F.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ BARIUM OXIDES ♦ ELECTRIC CONDUCTIVITY ♦ COPPER OXIDES ♦ HIGH-TC SUPERCONDUCTORS ♦ YTTRIUM OXIDES ♦ MONOCRYSTALS ♦ PHASE TRANSFORMATIONS ♦ POLYCRYSTALS ♦ TEMPERATURE DEPENDENCE
Abstract To prove the possible existence of an intrinsic double superconducting transition in the high-temperature copper oxide superconductors (HTSC), an effect recently attributed by various groups to different intrinsic properties of these materials (including unconventional wave pairing), we present in this paper high resolution data of the electrical resistivity, {rho}({ital T}), around the superconducting transition of different single crystal and polycrystal YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} samples. The analysis of the temperature derivative of these {rho}({ital T}) data strongly suggests that (i) with a temperature resolution well to within 20 mK, the intrinsic resistive transition of the HTSC does not present any double transition anomaly and (ii) the double peak structure observed in {ital d}{rho}({ital T})/{ital dT} by some authors is probably an extrinsic effect (associated with stoichiometric inhomogeneities in some cases, and with experimental artifacts in other cases). {copyright} {ital 1996 The American Physical Society.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-04-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 53
Issue Number 13


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