Superconductivity under high pressure of YBa2(Cu1−xMx)3O7−δ (M=Fe, Co, Al, Cr, Ni, and Zn)

J. G. Huber; W. J. Liverman; Youwen Xu; A. R. Moodenbaugh

doi:10.1103/PhysRevB.41.8757

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Superconductivity under high pressure of YBa2(Cu1−xMx)3O7−δ (M=Fe, Co, Al, Cr, Ni, and Zn)

J. G. Huber, W. J. Liverman, Youwen Xu, A. R. Moodenbaugh

DOI 10.1103/PhysRevB.41.8757 · Physical Review B

T1

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Abstract

A survey of the superconducting transition temperature Tc of YBa2Cu3O7−δ (1:2:3) and related superconductors as a function of pressure p(≤17 kbar) was made. Well-characterized samples, among them fully oxidized and oxygen-reduced 1:2:3 and Cu-substituted YBa2(Cu1−xMx)3O7−δ (M=Fe, Co, Al, Cr, Ni, and Zn), were prepared according to published methods. Small pieces (∼100 mg) of the samples were measured for superconductivity using an ac mutual inductance method. For YBa2Cu3O7 little pressure dependence is observed (dTc/dp=-0.01±0.02 K/kbar), in agreement with most previous work. However, with substitutions M=Fe, Co, or Al, a significant positive pressure dependence of Tc is observed, increasing with increasing M content. For M=Zn and Ni there is little pressure dependence of Tc. For an oxygen-reduced sample (δ=0.2)Tc increases with pressure.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	92	Pressure unresolved	midpoint
YBa2Cu3O6.8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure unresolved	midpoint