Possible pressure-induced valence changes in Tl2CaBa2Cu2O8 superconductors

B. Morosin; E. L. Venturini

doi:10.1103/PhysRevB.46.510

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Possible pressure-induced valence changes in Tl2CaBa2Cu2O8 superconductors

B. Morosin, E. L. Venturini

DOI 10.1103/PhysRevB.46.510 · Physical Review B

T1

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Abstract

The reported nonlinear pressure dependence of the superconducting critical temperature Tc in Tl2CaBa2Cu2O8 can be explained by valence changes deduced from the annealing behavior under various environments for single crystals of several Tl-Ca-Ba-Cu-O structure types. The pressure data are consistent with partial conversion of Tl+ to Tl3+ with increasing pressure (decreasing c-axis length), resulting in electron transfer from the Tl-O layers to the Cu-O2 sheets.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Tl2CaBa2Cu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown