Elastic modulus anomalies and their manifestation in the properties of high-temperature superconductors
Abstract
An interpretation based on a thermodynamic treatment of the dilatation modulus is proposed for experiments demonstrating changes in the speed of sound as a result of the superconducting transition. In particular, it is shown that the change in the speed of sound can be approximately related to a change in the Debye temperature, with the same relationship observed for free phonon energy. Changes of parameters in the Ginsburg-Landau phenomenological theory due to the effect of superconductivity on free phonon energy are identified which lead to changes in the magnitude of the critical thermodynamic magnetic field and in the depth of electromagnetic field penetration into the superconductor.
- Publication:
-
Zhurnal Eksperimentalnoi i Teoreticheskoi Fiziki
- Pub Date:
- November 1990
- Bibcode:
- 1990ZhETF..98.1814Z
- Keywords:
-
- Acoustic Velocity;
- High Temperature Superconductors;
- Mixed Oxides;
- Modulus Of Elasticity;
- Electromagnetic Fields;
- Landau-Ginzburg Equations;
- Phonon Beams;
- Thermodynamics;
- Solid-State Physics