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Mott insulator high T-c bipolaronic superconductor transition in cuprates - Discussion

Edwards, PP and Alexandrov, AS and Ramakrishnan, TV and McGreevy, R (1998) Mott insulator high T-c bipolaronic superconductor transition in cuprates - Discussion. In: Philosophical Transactions Of The Royal Society Of London Series A-Mathematical Physical And Engineering Sciences, 356 (1735). pp. 208-209.

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Abstract

All ‘undoped’ cuprates are antiferromagnetic Mott insulators. We argue that with doping they remain to be insulators including the ‘overdoped’ samples. Hence, there is no clear dividing line between non–metallic cuprates and high–temperature superconductors. Based on the generic Hamiltonian including the electron–phonon interaction and the direct Coulomb repulsion the ground state of doped cuprates is shown to be a charged 2e Bose liquid of small bipolarons. A theory of the normal state transport of copper oxides is developed. The temperature dependence of the resistivity and of the Hall effect agrees remarkably well with the experimental data in La2–xSrxCuO4 for the entire temperature regime including unusual ‘logarithmic’ low–temperature region. The violation of Kohler's rule in magnetoresistivity is explained. The resistive and thermodynamic superconducting transitions in a magnetic field are quantitatively described.

Item Type: Editorials/Short Communications
Additional Information: Copyright of this article belongs to Royal Soc London.
Department/Centre: Others
Date Deposited: 09 Jun 2011 06:26
Last Modified: 09 Jun 2011 06:26
URI: http://eprints.iisc.ernet.in/id/eprint/38173

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