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    • Keywords


      Anelasticity; elastic dipole; Snoek relaxation; density matrix; relaxation time

    • Abstract


      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.

    • Author Affiliations


      Radha Balakrishnan V Balakrishnan1

      1. Reactor Research Centre, Kalpakkam - 603 102
    • Dates

  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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