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Dynamical Properties of the Singlet—Singlet Van Vleck Paramagnet
Author(s) -
Cheung T. H.
Publication year - 1973
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.2220580217
Subject(s) - paramagnetism , singlet state , hamiltonian (control theory) , condensed matter physics , physics , transverse field , ising model , relaxation (psychology) , neutron scattering , scattering , quantum mechanics , mathematics , psychology , mathematical optimization , social psychology , excited state
The high temperature dynamical properties of the singlet—singlet model for the Van Vleck paramagnet is investigated. Such a system can be described by the Hamiltonian of the Ising model with a transverse field. Using the high temperature approximation of Mori's continued‐fraction representation, an approximate expression for the longitudinal relaxation function is derived. This leads to renormalized magnetic excitations and the appearance of a central peak for the corresponding spectral density. Its relevance to recent neutron scattering data is discussed.