Abstract
Here we present inelastic neutron scattering measurements from the frustrated, quantum spin-1/2 chain material linarite, PbCuSO4(OH)2. Time of flight data, taken at 0.5 K and zero applied magnetic field reveals low-energy dispersive spin wave excitations below 1.5 meV both parallel and perpendicular to the Cu-chain direction. From this we confirm that the interchain couplings within linarite are around 10% of the nearest neighbor intrachain interactions. We analyze the data within both linear spin-wave theory and density matrix renormalization group theories and establish the main magnetic exchange interactions and the simplest realistic Hamiltonian for this material.
| Original language | English |
|---|---|
| Article number | 024430 |
| Journal | Physical Review B |
| Volume | 95 |
| Issue number | 2 |
| DOIs | |
| State | Published - Jan 26 2017 |
Funding
We are grateful for the local support staff at the SNS. This research was supported in part by the DFG under Grant Nos. WO 1532/3-2, SU 229/9-2 and SFB-1143. This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. We acknowledge fruitful discussions with N. Shannon, O. Starykh, and U. Raler. We thank U. Nitzsche for technical assistance. We thank G. Heide and M. Gabelein from the Geoscientific Collection in Freiberg for providing the linarite crystals.