Superconductor-to-metal transition caused by oxygen nonstoichiometry in TlSr2CaCu2O7−δ having a Cu-O pyramidal layer

Y. Kubo; T. Kondo; Y. Shimakawa; T. Manako; H. Igarashi

doi:10.1103/PhysRevB.45.5553

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Superconductor-to-metal transition caused by oxygen nonstoichiometry in TlSr2CaCu2O7−δ having a Cu-O pyramidal layer

Y. Kubo, T. Kondo, Y. Shimakawa, T. Manako, H. Igarashi

DOI 10.1103/PhysRevB.45.5553 · Physical Review B

T1

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Abstract

A transition from a 68-K superconductor to an overdoped nonsuperconducting metal has been observed in TlSr2CaCu2O7−δ having a Cu-O pyramidal layer. This reversible transition is caused by a small change (∼0.08) in oxygen deficiency δ, without showing a significant change in the crystal structure. The Hall measurements demonstrate that the superconductivity is suppressed by overdoping of hole carriers. No significant changes of the Hall coefficient or the magnetic susceptibility are observed at the superconductor-metal phase boundary, suggesting a similarity and continuity between both the electronic structures. These features are quite similar to those for another overdoped system: Tl2Ba2CuO6+δ with a Cu-O octahedral layer.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
TlSr2CaCu2O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	68	Pressure not reported	unknown
Tl2Ba2CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	85	Pressure not reported	unknown