Abstract
The temperature-pressure phase diagram of BaTi has been determined by means of a dielectric measurement. All successive phase transition temperatures decrease with increasing pressure with critical index , in the classical limit, and , in the quantum limit. The dielectric behavior close to the quantum region agrees with the quantum theoretical prediction. In BaTi the crossover region from the classical limit to the quantum one is observed in the range of pressure 4 to 8 GPa and temperature 0 to 200 K.
- Received 1 October 1996
DOI:https://doi.org/10.1103/PhysRevLett.78.2397
©1997 American Physical Society