Total Moment Sum Rule for Magnets in the Vicinity of Quantum Critical Point
arXiv:2012.01669 · doi:10.7566/JPSJ.90.014701
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.
16 pages, 10 figures
References in corpus (7)
- Amplitude / Higgs Modes in Condensed Matter Physics
- Quantum Criticality
- Quantum Magnets under Pressure: Controlling Elementary Excitations in TlCuCl3
- Spin-stretching modes in anisotropic magnets: spin-wave excitations in the multiferroic Ba2CoGe2O7
- Direct observation of the Higgs amplitude mode in a two-dimensional quantum antiferromagnet near the quantum critical point
- Multiboson spin-wave theory for Ba2CoGe2O7, a spin-3/2 easy-plane Neel antiferromagnet with strong single-ion anisotropy
- Tuning the magnetic exchange via a control of orbital hybridization in Cr2(Te1-xWx)O6