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VOLUME 54 (1991) | ISSUE 1 | PAGE 62
Elastic properties of YBa2Cu3O7 single crystals at the superconducting phase transition
The results of new measurements of the elastic properties of õ÷ÁÚóÉÚï? single crystals by using a vibrating reed technique are reported. An extremely well expressed elastic anomaly at the superconducting phase transition has been discovered in some single crystals. This anomaly can be properly described in the framework of the Landau theory when the effects of Gaussian fluctuations are taken into account. The Landau discontinuity in the Young's modulus at the phase transition can be as large as 5 ž 102 ppm.