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Relation between the electronic structure and the superconductivity of cuprates as revealed by Cu 2p photoemission and theoretical investigations

Santra, AK and Sarma, DD and Rao, CNR (1991) Relation between the electronic structure and the superconductivity of cuprates as revealed by Cu 2p photoemission and theoretical investigations. In: Physical Review B, 43 (7). pp. 5612-5615.

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Abstract

Cu 2p core-level photoemission studies of $La_{2-x}Sr_xCuO_4$, $BiPbSr_2Y_{1-x}Ca_{1-x}Cu_2O_8$, and other cuprates show that the relative intensity of the satellite varies with the composition in a direction opposite to that of the hole concentration, $n_h$. The $I_s/I_M-n_h$ relations in the different cuprate series can be understood in terms of the $\Delta/t_{pd}$ ratio, where \Delta is the charge-transfer excitation energy and $t_{pd}$ is the hybridization strength between the Cu 3d and 0 2p orbitals. Interestingly, the $I_S/I_M$ ratio increases with the $\Delta/t_{pd}$ ratio in the cuprates. At a given value of $n_h$, e.g., around the value corresponding to maximum $T_c$, $I_S/I_M$ increases in the same direction as $T_c$, among the different series of cuprates, suggesting thereby that $T_c$, itself may be determined by $\Delta/t_{pd}$.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Physical Society.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 11 Mar 2008
Last Modified: 19 Sep 2010 04:43
URI: http://eprints.iisc.ernet.in/id/eprint/13377

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