Thermopower of Cuprate Superconductors under Hydrostatic Pressure
J.-S. Zhou, J. B. Goodenough
DOI 10.1103/PhysRevLett.77.151 · Physical Review Letters
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Abstract
Measurements of thermopower versus temperature under hydrostatic pressure are reported for La2−xSrxCuO4 having no charge reservoir and the underdoped YBa2Cu3O7−δ, which we demonstrate to have a pressure-induced electron transfer from the CuO2 sheets to the Cu(1)O1−δ reservoir planes. The CuO2 sheets exhibit a thermopower α(T)=α0+δα(T) in which α≈α0 at room temperature decreases with increasing hole concentration, and δα(T) is an enhancement having a maximum at Tmax=100–140 K. Correlation between dTc/dP and d(δα)/dP are discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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