Year: 2025
Type: article
Abstract: We measure the nonlinear magnetic susceptibility ${\ensuremath{\chi}}^{(3)}$ of the disordered quantum Ising magnet ${\mathrm{LiHo}}_{0.045}{\mathrm{Y}}_{0.955}{\mathrm{F}}_{4}$ and demonstrate four-wave mixing due to coherent (anti-)Stokes Raman scattering at $\ensuremath{\sim}100\text{ }\text{ }\mathrm{Hz}$ (peV) energy scales. The temperature dependence of ${\ensuremath{\chi}}^{(3)}$ approximately follows a $(1/T)$ form, with a high-$T$ cutoff that can be linked to dissipation in the coherent spin clusters. ${\ensuremath{\chi}}^{(3)}$ also decreases monotonically with a transverse field, approaching a constant offset above a few kOe, suggesting the presence of both coherent and spontaneous Raman scattering.
Source: Physical Review Letters
Authors: C. Simon, D. M. Silevitch, T. F. Rosenbaum
Institution: California Institute of Technology
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4407946499