Phenomenological Equations Relating Various Critical Anomalies above a Cubic-to-Tetragonal Phase Transition Point
作者： Katsumi Hamano , Shunsuke Hirotsu
DOI: 10.1143/JPSJ.48.168
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摘要: Phenomenological equations are derived which interrelate the anomalies in various thermodynamic quantities above transition point of a cubic-to-tetragonal phase caused by an instability triply degenerate soft mode. The anomalous part Gibbs free energy is assumed to be simple sum three parts represent contributions from fluctuation components. A cylindrical approximation adopted each taking into account symmetry fluctuations. theory predicts that adiabatic elastic compliances, s 11 , 12 and also - should exhibit proportional anomaly specific heat at constant pressure. This marked contrast with result generalized Pippard Garland, Janovec. new successfully tested for KMnF 3 CsPbCl CsPbBr . β-γ NH 4 Br discussed.
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