Thermal conductivity of polycrystalline YBa{sub 2}Cu{sub 4}O{sub 8} from 10 to 300 K

Journal Article · Fri May 01 04:00:00 EDT 1998 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.57.10923· OSTI ID:627840

Williams, R K; Scarbrough, J O ^[1]; Schmitz, J M; Thompson, J R ^[2]

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1. Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee37831-6116 (United States)
2. Department of Physics, University of Tennessee, Knoxville, Tennessee 37996-1200 (United States)

The thermal conductivity {lambda} and electrical resistivity {rho} were measured on two samples of the cuprate superconductor YBa{sub 2}Cu{sub 4}O{sub 8} (Y124). The {lambda} results pass through a maximum at about half of the superconducting transition temperature T{sub c}. The peak {lambda} value is much higher than the peak value for polycrystalline YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}, Y123, and is about equal to ab plane values for good melt processed Y123. In the normal state most of the {lambda} is due to phonon transport {lambda}{sub p} and estimates of {lambda}{sub p} were obtained from the data by making a correction for electronic transport. Phonon-phonon and phonon-electron scattering limit the {lambda}{sub p} of both Y124 and Y123. In the two compounds, the phonon-phonon scattering is about equally strong, but electron-phonon scattering is considerably weaker in Y124. In the superconducting state, below the {lambda} maximum at T{sub c}/2, {lambda} varies as T{sup n}(n{approx}1/2). This behavior has also been observed in Y123, but is not consistent with phonon scattering theory. The implications of this observation are discussed. {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 627840
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 17 Vol. 57; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRIC IMPEDANCE
ELECTRON-PHONON COUPLING
HIGH-TC SUPERCONDUCTORS
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
THERMAL CONDUCTIVITY
YTTRIUM OXIDES