Relationship between planar-copper–apical-oxygen bond length and charge transfer in YBa2Cu3O7−δ superconductors

Raju P. Gupta; Michèle Gupta

doi:10.1103/PhysRevB.51.15617

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Relationship between planar-copper–apical-oxygen bond length and charge transfer in YBa2Cu3O7−δ superconductors

Raju P. Gupta, Michèle Gupta

DOI 10.1103/PhysRevB.51.15617 · Physical Review B

T1

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Abstract

The variation of the hole density and hence the superconducting transition temperature Tc has been widely correlated with a variation in the planar-copper–apical-oxygen bond length. A decrease in this bond is usually taken to reflect an increase in the hole density in the CuO2 planes. Results of electronic-structure calculations are presented that show that a decrease in the planar-copper–apical-oxygen bond does enhance the hole density in the CuO2 planes in the YBa2Cu3O7 superconductor. However, this enhancement is relatively small. A major fraction of the hole density in this compound can thus be attributed to the oxygen atoms in the chains.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90	Pressure not reported	unknown