High Resolution Study of Spin Excitations in the Shastry-Sutherland Singlet Ground State of SrCu2(BO3)2

TL;DR

This study uses high-resolution neutron scattering to analyze spin excitations in SrCu2(BO3)2, revealing detailed dispersion relations and temperature behaviors of triplet states in its Shastry-Sutherland lattice.

Contribution

It provides the first detailed mapping of triplet excitation dispersions and their Q dependencies in SrCu2(BO3)2 using high-resolution inelastic neutron scattering.

Findings

Triplet excitations show continuous dispersion across the (H,0) direction.

Distinct Q dependencies differentiate single and multiple triplet excitations.

Excitation intensities vary with temperature in a manner related to dc-susceptibility.

Abstract

High resolution, inelastic neutron scattering measurements on SrCu2(BO3)2 reveal the dispersion of the three single triplet excitations continuously across the (H,0) direction within its tetragonal basal plane. These measurements also show distinct Q dependencies for the single and multiple triplet excitations, and that these excitations are largely dispersionless perpendicular to this plane. The temperature dependence of the intensities of these excitations is well described as the complement of the dc-susceptibility of SrCu2(BO3)2.