Dynamic Spin Structure Factor of SrCu2(BO3)2 at Finite Temperatures

TL;DR

This study uses finite temperature Lanczos calculations to analyze the spin structure factor of SrCu2(BO3)2, revealing unusual temperature-dependent spectral features consistent with neutron scattering experiments.

Contribution

First application of finite temperature Lanczos method to compute dynamical spin structure factor in SrCu2(BO3)2, highlighting its temperature evolution and agreement with experimental data.

Findings

Peak intensities are wavevector-independent.

Spectral features show unusual temperature dependence.

Results align with inelastic neutron scattering measurements.

Abstract

Using finite temperature Lanczos technique on finite clusters we calculate dynamical spin structure factor of the quasi-two-dimensional dimer spin liquid SrCu2(BO3)2 as a function of wavevector and temperature. Unusual temperature dependence of calculated spectra is in agreement with inelastic neutron scattering measurements. Normalized peak intensities of the single-triplet peak are q-independent, their unusual temperature dependence is analyzed in terms of thermodynamic quantities.