Thermal-conductivity anisotropy of single-crystal Bi sub 2 Sr sub 2 CaCu sub 2 O sub 8

Journal Article · Mon Dec 31 23:00:00 EST 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.408· OSTI ID:6072531

Crommie, M F; Zettl, A ^[1]

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1. Department of Physics, University of California at Berkeley, and Materials and Chemical Sciences Division of the Lawrence Berkeley Laboratory, Berkeley, California 94720 (US)

We have measured the out-of-plane ({ital c}-axis) thermal conductivity {kappa}{sub {ital c}} of single-crystal Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} from room temperature to 40 K. In contrast to the previously measured in-plane thermal conductivity {kappa}{sub {ital a}{ital b}},{kappa}{sub {ital c}} appears to be phonon dominated and shows no dramatic anomaly at the superconducting transition temperature {ital T}{sub {ital c}}. In the normal state above {ital T}{sub {ital c}}, the electrical conductivity anisotropy {sigma}{sub {ital a}{ital b}}/{sigma}{sub {ital c}} is of order 10{sup 4} and is strongly temperature dependent, while {kappa}{sub {ital a}{ital b}}/{kappa}{sub {ital c}}{approx}6, independent of temperature. Our results suggest an important role played by defect scattering in the {ital c}-axis transport mechanism of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8}.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6072531
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:1; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

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& Refractories-- Physical Properties
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CALCIUM COMPOUNDS
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