Possible overdoping in TlSrLaCuO5 and superconductivity in TlBaLaCuO5 by isovalent-cation substitution

A. Sundaresan; R. Nagarajan; L. C. Gupta; R. Vijayaraghavan; M. Sharon; A. S. Tamhane; R. Pinto

doi:10.1103/PhysRevB.49.13123

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Possible overdoping in TlSrLaCuO5 and superconductivity in TlBaLaCuO5 by isovalent-cation substitution

A. Sundaresan, R. Nagarajan, L. C. Gupta, R. Vijayaraghavan, M. Sharon, A. S. Tamhane, R. Pinto

DOI 10.1103/PhysRevB.49.13123 · Physical Review B

T1

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Abstract

It is known that superconductivity in TlSrLaCuO5 is due to the overlap of empty Tl 6s band with the antibonding Cu 3dx2-y2 band at the Fermi level. This motivated us to investigate the effects of isovalent-cation substitution in superconducting TlSrLaCuO5 and semiconducting TlBaLaCuO5. We have succeeded in inducing superconductivity in TlBaLaCuO5 by introducing Ca2+ at the Ba sites.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
TlSrLaCuO5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	32	Pressure not reported	onset
TlBa0.6Sr0.4LaCuO5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	20	Pressure not reported	onset
TlBa0.3Sr0.7LaCuO5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	onset
TlSr0.7Ca0.3LaCuO5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	32	Pressure not reported	onset
TlSr0.7Ca0.3LaCuO5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	zero_resistance
TlSr0.4Ca0.6LaCuO5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	26	Pressure not reported	onset
TlSr0.4Ca0.6LaCuO5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	20	Pressure not reported	zero_resistance
TlBa0.6Ca0.4LaCuO5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	14	Pressure not reported	onset
TlBa0.4Ca0.6LaCuO5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	16	Pressure not reported	onset
TlBa0.4Ca0.6LaCuO5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	13	Pressure not reported	zero_resistance
TlBa0.2Ca0.8LaCuO5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	13	Pressure not reported	onset