Macroscopic Quantum Phenomena

Condensation of fermions occurs in superconductivity, and superfluid (sup3)He condensation of bosons is found in superfluid (sup4)He and in the laser. These phenomena are described. Then it will be asked whether a coherent quantum state could occur in a quantum paraelectric such as SrTiO(sub3) electron paramagnetic resonance, recent high-energy X-Ray diffraction and accurate elastic constant measurements in this double oxide would be compatible with the existence of such a state and will be reviewed. If such a coherent state exists, second sound perpendicular to the tetragonal c-axis in SrTiO(sub3) could be observed.

By: K. Alex Mueller

Published in: Ferroelectrics, volume 183, (no ), pages 11-24 in 1996

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