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Modifications of KN Theory for Weak Resonance and Dislocation Scattering of Phonons
Author(s) -
Singh M. P.,
Verma G. S.
Publication year - 1974
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.2220660137
Subject(s) - scattering , condensed matter physics , phonon , resonance (particle physics) , phonon scattering , dislocation , physics , atomic physics , quantum mechanics
The resonance scattering of phonons in Co ++ doped CdS is investigated both in the presence and absence of magnetic fields on the basis of modified expressions of Kozakov and Nagaev, which include weak resonance scattering of phonons for the off‐resonance situations T < T R , where T R is the resonance temperature. It is possible to establish that the major contribution to resistivity due to resonance scattering of phonons comes from the virtual transition between the magnetic field split states | + 1/2 〉 and | −1/2〉. Similar modifications of KN expressions for the weak dislocation scattering as well as the weak resonance scattering for ω>ω r lead to plausible explanations for the unexplained depressions in the phonon conductivity of CaF 2 in the temperature range 2 to 4 °K.