Density matrix formalism for anelastic relaxation

Balakrishnan, Radha ; Balakrishnan, V. (1978) Density matrix formalism for anelastic relaxation Pramana - Journal of Physics, 11 (5). pp. 639-659. ISSN 0304-4289

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A density matrix formalism is developed for anelastic (mechanical) relaxation in crystalline materials with point defects characterized by elastic dipoles. The time-dependent approach to equilibrium of the strain response under the action of a constant applied stress is deduced. The formalism parallels the one used in nuclear magnetic relaxation. The anelastic relaxation time is determined as a function of the parameters occurring in the defect hopping term in the Hamiltonian. This term is responsible for the dissipation of the anelastic 'potential' energy into the host lattice. In a lengthy concluding section, the following aspects are discussed point by point: the advantages of the formalism presented, its scope and special cases; the physical implications of the expression obtained for the relaxation time; the similarities and differences between magnetic relaxation and anelastic relaxation, etc.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Anelasticity; Elastic Dipole; Snoek Relaxation; Density Matrix; Relaxation Time
ID Code:1063
Deposited On:25 Sep 2010 11:10
Last Modified:16 May 2016 12:14

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