Elastic properties of YBa2Cu3O7 single crystals at the superconducting phase transition
Japaridze S. K., Kvirickashvili T. Sh., Melik-Shahchnazarov V. A., Mirsoeva I.I., Makarenko I. N., Stishov S. M.
The results of new measurements of the elastic properties of YBa2Cu307 single crystals using a vibrating-reed technique are reported. An extremely well expressed elastic anomaly at the superconducting phase transition has been observed in some single crystals. This anomaly can be correctly described by the Landau theory when the Gaussian fluctuations are taken into account. The Landau discontinuity in the Young's modulus at the phase transition can be as large as 5 Χ102 ppm.