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Charge redistribution and properties of high-temperature superconductors

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journal contribution
posted on 2006-04-27, 11:29 authored by D.I. Khomskii, F.V. Kusmartsev
We show that in high-Tc superconductors (HTSC) with two groups of electrons (e.g., holes in CuO2 planes and in a ‘‘reservoir’’) there should exist a charge redistribution with the temperature: the hole concentration Nh in ‘‘active’’ superconducting CuO2 planes increases below Tc. This effect may explain structural changes such as the shift of the apical oxygen atom, anomalous thermal expansion, the shift of nuclear quadrupole resonance lines, the change of the positron lifetime, and the modification of the ion channeling below Tc. Some other possible consequences of the charge redistribution (the modification of the temperature dependence of a gap Δ and of the ratio 2Δ0/Tc, the phenomena at a contact of HTSC with normal metals and semiconductors) are discussed. We show that in high-Tc superconductors (HTSC) with two groups of electrons (e.g., holes in CuO2 planes and in a ‘‘reservoir’’) there should exist a charge redistribution with the temperature: the hole concentration Nh in ‘‘active’’ superconducting CuO2 planes increases below Tc. This effect may explain structural changes such as the shift of the apical oxygen atom, anomalous thermal expansion, the shift of nuclear quadrupole resonance lines, the change of the positron lifetime, and the modification of the ion channeling below Tc. Some other possible consequences of the charge redistribution (the modification of the temperature dependence of a gap Δ and of the ratio 2Δ0/Tc, the phenomena at a contact of HTSC with normal metals and semiconductors) are discussed.

History

School

  • Science

Department

  • Physics

Pages

757478 bytes

Citation

KHOMSKII and KUSMARTSEV, 1992. Charge redistribution and properties of high-temperature superconductors. Physical Review B, 46(21), pp. 14245–14248

Publisher

© American Physical Society

Publication date

1992

Notes

This article has been published in the journal, Physical Review B [© American Physical Society]. It is also available at: http://link.aps.org/abstract/PRB/v46/p14245.

ISSN

0556-2805

Language

en