Pressure Dependence at Low Temperatures of Thermodynamic Properties of the Heavy Fermion Compound CeAl sub 3

• Published in: Journal of physics. Condensed matter Vol. 4; no. 35; pp. L455 - L460
• Main Author: Barron, T H K
• Format: Journal Article
• Language: English
• Published: 31.08.1992
• ISSN: 0953-8984

Values of ( delta beta / delta P) sub T derived thermodynamically from the zero pressure ultrasonic data of Niksch and co-workers indicate that the absolute magnitude of the volumetric thermal expansion coefficient beta should be initially enhanced by pressure both at very low temperatures, where beta is negative, and at higher temperatures when beta becomes positive. Values of [ delta exp 2 (C sub P /T)/ mu P exp 2 ] sub T , similarly derived, are in qualitative agreement with measurements of C sub P under pressure above 0.5K, but at lower temperatures exacerbate an apparent inconsistency with thermal expansion data noted earlier by Brodale and co-workers; it is unlikely that this anomaly is due solely to sample variation.