Ferroelasticity in Y-Ba-Cu-O. II. Relaxational effects

Abstract

The "spring-defect model" developed by us earlier to discuss ferroelusticity, exhibited in the orthorhombic phase of YBazCn307--8 (Y-Ba-Cu-0), is used to analyze anelustic relaxation around the paraelastic to ferroelastic phase transition under the influence of an external inhomogeneous stress. The kinetics of the underlying Hamiltonian representing struin-struin interactions is treated within mean-field theory. The relation-response relation of linear response theory is employed to derive explicit expressions for the anelastic strain, the frequency-dependent compliance and the internal friction in terms of the basic parameters of the springdefect model.