Pressure dependence of the superconducting transition temperature of YBa2Cu3O7 as a function of carrier concentration: A test for a simple charge-transfer model

J. J. Neumeier; H. A. Zimmermann

doi:10.1103/PhysRevB.47.8385

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Pressure dependence of the superconducting transition temperature of YBa2Cu3O7 as a function of carrier concentration: A test for a simple charge-transfer model

J. J. Neumeier, H. A. Zimmermann

DOI 10.1103/PhysRevB.47.8385 · Physical Review B

T1

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Abstract

Measurements of the superconducting transition temperature Tc vs purely hydrostatic pressure (P<0.6 GPa) on specimens of compositions YBa2−xLaxCu3O7−δ (0≤x≤0.14) and Y1−yCayBa2Cu3O7−δ (0≤y≤0.06) yield an approximately linear relation between dTc/dP and the carrier concentration induced in the CuO2 planes by chemical substitution with dTc/dP ranging from -0.6 K/GPa (y=0.06) to +2.2 K/GPa (x=0.14). A simple phenomenological model clarifies the dTc/dP behavior and provides a physical origin for the observed anomalous peak in Tc(P) at P∼4 GPa [Klotz, Reith, and Schilling, Physica C 172, 423 (1991)].

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2-xLaxCu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Y1-yCayBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Y0.97Ca0.03Ba2Cu3O6.97 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	87.5	0.137 GPa	midpoint
Y0.97Ca0.03Ba2Cu3O6.97 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	87	0.46 GPa	midpoint
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	91.3	Pressure unresolved	midpoint
(Yb0.7Ca0.3)(Ba0.8Sr0.2)2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Tl2Ba2CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown