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The superconducting gap and an unidentified 110–190 K phase of YBa2Cu3O7 observed by far-infrared ellipsometry

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Zeitschrift für Physik B Condensed Matter

Abstract

We have measured the complex dielectric function of pure and Fe-doped YBa2Cu3O7 ceramics, between 10 and 150 cm−1 and 20 and 300 K, with a far-infrared, rotating-analyzer laser ellipsometer. The superconducting phase transition and the gap energy are clearly observable. The undoped ceramic exhibits remarkable dielectric hysteresis between 110 K and 190 K. This points to a still unidentified phase which we observe to be sensitive to a weak magnetic field.

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  1. Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, W-7000, Stuttgart 80, Germany

    K. -L. Barth & F. Keilmann

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  1. K. -L. Barth
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  2. F. Keilmann
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Barth, K.L., Keilmann, F. The superconducting gap and an unidentified 110–190 K phase of YBa2Cu3O7 observed by far-infrared ellipsometry. Z. Physik B - Condensed Matter 91, 419–422 (1993). https://doi.org/10.1007/BF01316818

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  • DOI: https://doi.org/10.1007/BF01316818

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