Thermopower of Cuprate Superconductors under Hydrostatic Pressure
- Center for Materials Science and Engineering, ETC 9.102, University of Texas at Austin, Austin, Texas 78712-1063 (United States)
Measurements of thermopower versus temperature under hydrostatic pressure are reported for La{sub 2{minus}{ital x}}Sr{sub {ital x}}CuO{sub 4} having no charge reservoir and the underdoped YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}, which we demonstrate to have a pressure-induced electron transfer from the CuO{sub 2} sheets to the Cu(1)O{sub 1{minus}{delta}} reservoir planes. The CuO{sub 2} sheets exhibit a thermopower {alpha}({ital T})={alpha}{sub 0}+{delta}{alpha}({ital T}) in which {alpha}{approx_equal}{alpha}{sub 0} at room temperature decreases with increasing hole concentration, and {delta}{alpha}({ital T}) is an enhancement having a maximum at {ital T}{sub max}=100{endash}140K. Correlation between {ital dT}{sub {ital c}}/{ital dP} and {ital d}({delta}{alpha})/{ital dP} are discussed. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 286039
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 1 Vol. 77; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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