Structural stability of LuBa2Cu3O7−δ and superconductivity in thin films of Lu1−xMxBa2Cu3O7−δ (M=Pr, Tb, and Ce)

K. I. Gnanasekar; R. Pinto; A. S. Tamhane; L. C. Gupta; S. P. Pai; P. R. Apte; M. Sharon; R. Vijayaraghavan

doi:10.1103/PhysRevB.52.1362

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Structural stability of LuBa2Cu3O7−δ and superconductivity in thin films of Lu1−xMxBa2Cu3O7−δ (M=Pr, Tb, and Ce)

K. I. Gnanasekar, R. Pinto, A. S. Tamhane, L. C. Gupta, S. P. Pai, P. R. Apte, M. Sharon, R. Vijayaraghavan

DOI 10.1103/PhysRevB.52.1362 · Physical Review B

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Abstract

We present here the results of our investigations of the structural and superconducting properties of thin films of Lu1−xMxBa2Cu3O7−δ (M=Ce, Pr, and Tb), the three ambivalent rare-earth ions. Our results show that Pr and Tb ions are in the trivalent state and Ce ions are tetravalent. Structural (in)stability of the parent material LuBa2Cu3O7−δ forms the basis of our arguments. We suggest a simple model to account for the influence of Pr ions on superconductivity in cuprates.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Lu1-xTbxBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	88	Pressure not reported	onset
Lu0.8Tb0.2Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	88	Pressure not reported	onset
LuBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90	Pressure not reported	unknown