# Role of the $Cu-O$ charge-transfer energy in the superconductivity of cuprates: evidence from Cu 2p core-level spectroscopy and theory

Rao, CNR and Rao, Ranga G and Rajumon, MK and Sarma, DD (1990) Role of the $Cu-O$ charge-transfer energy in the superconductivity of cuprates: evidence from Cu 2p core-level spectroscopy and theory. In: Physical Review B (Condensed Matter), 42 (1). pp. 1026-1028.

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## Abstract

Based on Cu 2p core-level spectroscopy and theoretical calculations, it has been demonstrated that the $Cu-O$ charge-transfer excitation energy which determines the Cu 2p satellite intensity also plays a crucial role in the superconductivity of cuprates. The relative intensity of the satellite generally decreases with an increase in the $T_c$ or in the hole concentration in a given series of cuprate superconductors. In the case of $Bi_2Ca_{1-x}R_xSr_2Cu_2O_{8+\delta}$ (R=rare earth), the satellite intensity goes through a minimum around the same composition where the hole concentration as well as the $T_c$ show maxima.

Item Type: Journal Article Physical Review B (Condensed Matter) The American Physical Society Copyright of this article belongs to The American Physical Society. Division of Chemical Sciences > Solid State & Structural Chemistry Unit 17 Feb 2008 19 Sep 2010 04:42 http://eprints.iisc.ac.in/id/eprint/13013