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Dominant role of the Cu-O charge-transfer energy, electronic polarizability and associated factors in the superconductivity of cuprates

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dc.contributor.author Rao, C N R
dc.contributor.author Ramasesha, S
dc.contributor.author Sarma, D D
dc.contributor.author Santra, A K
dc.date.accessioned 2012-11-15T08:02:16Z
dc.date.available 2012-11-15T08:02:16Z
dc.date.issued 1991-03
dc.identifier 0038-1098 en_US
dc.identifier.citation Solid State Communications 77(9), 709-711 (1991) en_US
dc.identifier.uri https://libjncir.jncasr.ac.in/xmlui/10572/975
dc.description Restricted Access en_US
dc.description.abstract Although it is believed that there is strong hybridization between the Cu(3d) and O(2p) orbitals in the layered cuprates and that the parent compounds such as La2CuO4 are charge-transfer gap insulators, very few models consider the Cu-O charge-transfer energy, Δ, or the hybridization strength, tpd, to be the important factors responsible for the superconductivity of these materials. Based on the crucial experimental observation that the relative intensity of the features in Cu(2p) photoemission of several families of cuprates varies systematically with the hole concentration, nh, we have been able to show that both these properties vary smoothly with Δ /tpd. More importantly, we show that the electronic polarizability of the CuO2 sheets, α , is sufficiently large to favour hole pairing and that the value α also depends on Δ/tpd. Both nh and α increase smoothly with decreasing Δ /tpd. Considering that the maximum Tc in the various cuprate families containing the same number of CuO2 sheets occurs around the same nh value (e.g., nh≈ 0.2 in cuprates with two CuO2 sheets). The present study demonstrates how Δ /tpd, α and such chemical bonding characteristics have an important bearing on the superconducting properties of the cuprates. en_US
dc.description.uri http://dx.doi.org/10.1016/0038-1098(91)90774-P en_US
dc.language.iso en en_US
dc.publisher Pergamon-Elsevier Science Ltd en_US
dc.rights © 1991 Pergamon Press Ltd en_US
dc.subject charge-transfer energy en_US
dc.subject electronic polarizability en_US
dc.subject superconductivity of cuprates en_US
dc.subject photoemission en_US
dc.title Dominant role of the Cu-O charge-transfer energy, electronic polarizability and associated factors in the superconductivity of cuprates en_US
dc.type Article en_US


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