New type of antiferromagnetic polaron and bipolaron in HTc - superconductors

Details New type of antiferromagnetic polaron and bipolaron in HTc - superconductors New type of antiferromagnetic polaron and bipolaron in HTc - superconductors

1999-07-06

arxiv.org/abs/cond-mat/9907081v1

Physics

Condensed Matter

Superconductivity

3 pages 2 figures

Scientific paper

10.1016/S0921-4526(99)02005-0

The possibility of formation of a new type of polaron based on the quantum aniferromagnet (AF) model is reported. We take into account exchange interactions between localized d-d spins of the AF, as well as the p-d interaction of the AF with p-carriers. The energy minimum is found when maximum charge density occurs on every second spin. The formation of such ``comb''-like polarons results from the damping of quantum fluctuations and the appearance of Van Vleck-like staggered magnetization. Such polarons tend to form pairs coupled by an AF ``glue''.

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