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Title: | The Blackett Memorial Lecture, 1991 : Chemical Insights into High-Temperature Superconductors |
Authors: | Rao, C N R |
Keywords: | Copper-Oxide Superconductors High-Tc Superconductivity Atmosphere Oxygen-Pressure Neutron Powder Diffraction X-Ray Absorption Cu-O System Cuprate Superconductors Magnetic-Properties Crystal-Chemistry Thallium Cuprate |
Issue Date: | 16-Sep-1991 |
Publisher: | Royal Society London |
Citation: | Philosophical Transactions Of The Royal Society Of London Series A : Mathematical, Physical Sciences and Engineering 336(1644), 595-624 (1991) |
Abstract: | The high-temperature superconductors are complex oxides, generally containing two-dimensional CuO2 sheets. Various families of the cuprate superconductors are described, paying special attention to aspects related to oxygen stoichiometry, phase stability, synthesis and chemical manipulation of charge carriers. Other aspects discussed are chemical applications of cuprates, possibly as gas sensors and copper-free oxide superconductors. All but the substituted Nd and Pr cuprates are hole-superconductors. Several families of cuprates show a nearly constant n(h) at maximum T(c). Besides this universality, the cuprates exhibit a number of striking common features. Based on Cu(2p) photoemission studies, it is found that the Cu-O charge-transfer energy, DELTA, and the Cu(3d)-O(2p) hybridization strength, t(pd), are key factors in the superconductivity of cuprates. The relative intensity of the satellite in the Cu(2p) core-level spectra, the polarizability of the CuO2 sheets as well as the hole concentration are related to DELTA/t(pd). These chemical bonding factors have to be explicitly taken into account in any model for superconductivity of the cuprates. |
Description: | Review. Restricted Access. |
URI: | https://libjncir.jncasr.ac.in/xmlui/10572/1115 |
Other Identifiers: | 1364-503X |
Appears in Collections: | Research Papers (Prof. C.N.R. Rao) |
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sl.no15.1991.Philosophical Transactions Of The Royal Society Of London Series A-Mathematical Physical And Engineering Sciences 336 (1644), 595-624.pdf Restricted Access | 3.46 MB | Adobe PDF | View/Open Request a copy |
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