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Unified Theory of Colossal Magnetoresistance in Manganites and High Temperature Superconductivity in Cuprates by A.S Alexandrov is a Physics and Astronomy article available to read on EtoBox.

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The bipolaron theory of superconductivity provides a parameter-free fit of the superconducting critical temperature and the upper critical field of cuprates. It describes their non-Fermi-liquid normal state, including the in-plane and out-of-plane resistivity, Hall effect, magnetic susceptibility and tunnelling and photoemission spectra. The theory is based on the experimental fact that the electron-phonon interaction in doped oxides is the largest one. We show that the same interaction together with the p -d exchange interaction explains the ferromagnetism and colossal magnetoresistance (CMR) of doped manganites as a result of the pairing of polaronic carriers in the paramagnetic phase and a pair-breaking effect in the ferromagnetic phase. The theory is largely independent of the type of the electron-phonon interaction and the size of bipolarons and, in addition to perovskite manganites, applies to pyrochlore manganites where the Jahn-TeUer phonons and double-exchange mechanism are absent. It accounts for the dc and ac colossal magnetoresistivity, for low mobility, for the sudden spectral weight transfer with temperature in the optical conductivity and photoemission, for a strongl

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Author

A.S Alexandrov

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0921-4534)

Published

2000

Language

EN

Field

Physics and Astronomy (Physical Sciences)