Transport Properties of a YBa{sub 2}Cu{sub 4}O{sub 8} Crystal under High Pressure
Journal Article
·
· Physical Review Letters
- Center for Material Science and Engineering, University of Texas at Austin, Austin, Texas 78712 (United States)
- Department of Physics, Northern Illinois University, DeKalb, Illinois 60116 (United States)
Measurements of the temperature dependence of the resistivity {rho}{sub {ital a}},{rho}{sub {ital b}}, resistance {ital R}{sub {ital c}}, and thermoelectric power {alpha}{sub {ital a}},{alpha}{sub {ital b}},{alpha}{sub {ital c}} for a YBa{sub 2}Cu{sub 4}O{sub 8} crystal under high pressure verify that the CuO{sub 2} sheets are oxidized by pressure-induced electron transfer from the CuO{sub 2} sheets to the Cu(1)-O double chains. The anomaly in the CuO{sub 2}-sheet resistivity {rho}{sub {ital a}} at {ital T}{approx_equal}170 K, which moves to a higher temperature on oxidation of the CuO{sub 2} sheets, is correlated to a change in the character of {ital R}{sub {ital c}}. Our data also demonstrate unambiguously the contribution to the transport properties from Cu-O chains. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 397653
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 20 Vol. 77; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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