Thermal conductivity of SmBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} oxidized at 250 bar: A comparison of the phonon and electron models

Journal Article · Sat Nov 01 04:00:00 EST 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.56.11267· OSTI ID:544923

Plackowski, T; Jezowski, A; Bukowski, Z; Sulkowski, C; Misiorek, H ^[1]

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1. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 937, 50-950 Wroclaw 2 (Poland)

The thermal conductivity ({kappa}) of SmBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}, a high-T{sub c} superconductor (HTSC) with T{sub c}{approx}95K, was measured in the temperature range 4{endash}300 K. Two samples were examined, both were oxidized under 1 bar pressure, and the second one was additionally oxidized under a pressure of 250 bars. The latter sample exhibited a significant increase of {kappa} (by {approximately}80{percent} at room temperature) as well as a much higher maximum in {kappa}(T) below T{sub c} ({approximately}50{percent} in comparison to {approximately}20{percent} for the nonpressurized sample). A comparison with data of electrical resistivity for these samples indicates that the thermal conductivity of HTSC ceramics is not sensitive to the quality of grain boundaries. The thermal conductivity data for both samples were analyzed within two competing models explaining the origin of the superconducting maximum: the phonon model introduced by Tewordt and W{umlt o}lkhausen and the electronic model proposed by Yu and co-workers. Some arguments in favor of the electronic model have been given. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 544923
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 17 Vol. 56; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRON-PHONON COUPLING
HIGH-TC SUPERCONDUCTORS
OXIDATION
PRESSURE DEPENDENCE
SAMARIUM OXIDES
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
THERMAL CONDUCTIVITY