Superconductivity at 90 K in the Tl-Ba-Cu-O system

Z. Z. Sheng; A. M. Hermann; A. El Ali; C. Almasan; J. Estrada; T. Datta; R. J. Matson

doi:10.1103/PhysRevLett.60.937

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Superconductivity at 90 K in the Tl-Ba-Cu-O system

Z. Z. Sheng, A. M. Hermann, A. El Ali, C. Almasan, J. Estrada, T. Datta, R. J. Matson

DOI 10.1103/PhysRevLett.60.937 · Physical Review Letters

T1

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Abstract

Stable and reproducible superconductivity has been unambiguously observed in a new Tl-Ba-Cu-O system containing no group-IIIB elements. Resistance in these rare-earth–free oxides starts to drop sharply above 90 K and reaches zero at 81 K. Meissner flux expulsion and diamagnetic shielding show bulk superconductivity. Further substitutions of elements for this system may lead to even higher-temperature superconductors.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
TlBaCu3O5.5+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90	Pressure unresolved	onset
TlBaCu3O5.5+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	81	Pressure unresolved	zero_resistance
Tl1.5Ba2Cu3O7.3+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90	Pressure unresolved	onset
Tl1.5Ba2Cu3O7.3+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	81	Pressure unresolved	zero_resistance
TlBaCu3O5.5+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	85	Pressure unresolved	onset
YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90	Pressure not reported	unknown
YBa2Ag3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	50	Pressure not reported	unknown