Total Moment Sum Rule for Magnets in the Vicinity of Quantum Critical Point
Strongly Correlated Electrons
2020-12-04 v1 Materials Science
Abstract
It is known that the longitudinal and transverse excitation modes can exist in the vicinity of a quantum critical point in the ordered phase of quantum magnetic systems. The total moment sum rule for such systems is derived on the basis of the extended spin-wave theory, where both longitudinal and transverse magnetic excitations are taken into account. The sum rule is resolved into elastic, one-magnon, and two-magnon components. The formulation is applicable to spin systems with the longitudinal mode, such as systems with single-ion anisotropy of easy-plane type and spin dimer systems. The result helps us analyze and understand measured data of inelastic neutron scattering.
Keywords
Cite
@article{arxiv.2012.01669,
title = {Total Moment Sum Rule for Magnets in the Vicinity of Quantum Critical Point},
author = {Masashige Matsumoto},
journal= {arXiv preprint arXiv:2012.01669},
year = {2020}
}
Comments
16 pages, 10 figures