130-K superconductivity and microwave absorption in Tl-Ba-Ca-Cu-O

Zhao Min-Guang; Yan Qi-Li

doi:10.1103/PhysRevB.39.862

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130-K superconductivity and microwave absorption in Tl-Ba-Ca-Cu-O

Zhao Min-Guang, Yan Qi-Li

DOI 10.1103/PhysRevB.39.862 · Physical Review B

T1

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Abstract

In a Tl-Ba-Ca-Cu-O oxide, prepared by means of conventional ceramic technique, the zero-resistance temperature was found to be 127±0.5 K and the diamagnetic transition temperature to be 130±1 K. An ESR measurement shows that there is an intense low-field microwave-absorption peak below Tc (R=0) in the sample. This means that the superconductivity of Tl-Ca-Ba-Cu-O is either associated with the glass feature or with the spin-triplet state of Cu2+-Cu2+ pairs via the exchange interaction mediated by an O− ion, as is indirectly supported by the similar microwave absorption measurement on single-crystal LiNbO3: Cu2+.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Tl2BaCa2Cu3O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	136	Pressure not reported	onset
Tl2BaCa2Cu3O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	127	Pressure not reported	zero_resistance
Tl2BaCa2Cu3O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	130	Pressure not reported	onset