Origins of diffuse inelastic neutron scattering from frustrated quantum magnets
Inelastic magnetic neutron scattering is a key diagnostic tool for quantum spin liquids. For the one-dimensional spin-1/2 chain a continuum of scattering has been measured and found in detailed agreement with exact theoretical results for multi-spinon scattering.
In this talk I will describe neutron scattering studies of spin liquid candidates in two and three dimensions including NiGa 2 S 4 , NaCaNi 2 F 7 , NaSrMn 2 F 7 , and Yb 2 Ti 2 O 7 . While we do observe broad excitation spectra, these may result from the loss of momentum conservation due to the disordered spin configurations induced by competing interactions. The effects are interesting and need to be understood in the ongoing pursuit of materials realizations of quantum spin liquids beyond one dimension.
Host: Prof. Je-Geun Park