Abstract
A theory for the critical behaviour of the Ising model in a transverse field is presented. The existence of a central component in the spectral density of the longitudinal spin relaxation function is shown to result self-consistently from decay into itself and energy-fluctuation diffusion mode. Estimates of the various quantities are made forT nearT c , the damping is seen to be temperature dependent. Our theory is appropriate for the caseΓ ∼J whereΓ andJ are the magnitudes of the transverse field and the exchange interaction between the spins respectively. Its relevance to neutron scattering data on Van Vleck paramagnets is discussed.
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Cheung, T.H. Critical behaviour of the ising model in a transverse field. Z. Physik 267, 251–256 (1974). https://doi.org/10.1007/BF01669444
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DOI: https://doi.org/10.1007/BF01669444