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Pairing of off-center polarons due to dipole-dipole interaction: Possible clue to the high-temperature superconductivity

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Zeitschrift für Physik B Condensed Matter

Abstract

An alternative type of small polaron associated with an off-center configurational distortion can arise from the additional coupling of the electron to some appropriate odd vibrational mode. The model is exemplified by quantum-mechanical calculations of the vibronic mixing of two different-parity electronic states of the truncated Coulomb potential by an odd-parity vibration of two-neighboring ions: the Pseudo-Jahn-Teller effect. These calculations manifest the feasibility of the model and suggest that off-center polarons may occur in perovskites. Each off-center polaron is inherently polarizable in an electric field. Consequently, neighboring entities can couple through the universal Van der Waals force to form bipolarons. The off-center vibronic polarizability is temperature-dependent and so is the binding which decreases gradually as the temperature is raised. As a result, these Van der Waals bipolarons may cover the range from small-radius bipolarons, exhibiting a specific type of superconductivity, to large-radius species, which are similar to Cooper pairs. The model compares favorably with many specific features of the high-T c superconductivity.

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Authors and Affiliations

  1. Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Lenin Blvd, BG-1784, Sofia, Bulgaria

    M. Borissov & M. Georgiev

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  1. M. Borissov
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  2. M. Georgiev
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Borissov, M., Georgiev, M. Pairing of off-center polarons due to dipole-dipole interaction: Possible clue to the high-temperature superconductivity. Z. Physik B - Condensed Matter 70, 413–420 (1988). https://doi.org/10.1007/BF01312113

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  • DOI: https://doi.org/10.1007/BF01312113

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