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Optical‐acoustic two‐phonon relaxation in spin systems
Author(s) -
Singh A.,
Shrivastava K. N.
Publication year - 1979
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220950131
Subject(s) - phonon , condensed matter physics , debye model , relaxation (psychology) , raman spectroscopy , debye , spin (aerodynamics) , spin–lattice relaxation , materials science , physics , thermodynamics , quantum mechanics , nuclear quadrupole resonance , psychology , social psychology
The two phonon Raman process of spin–lattice relaxation is investigated in spin systems having electronic properties appropriate to both optical and acoustic branches of phonon spectrum. Apart from exponential temperature dependence of relaxation times for resonance processes, T −3 ‐, T −4 ‐, T −5 , and T −6 ‐processes are found for both branches under several conditions. However, when the Debye energy is very high, the T −2 ‐dependence dominates with corrections of T −3 and T −4 . The level structure of the spin system is found to be important for the temperature dependence of relaxation times.