Publications associated with Correlated Electron Systems

Quantum-critical spin dynamics in a Tomonaga-Luttinger liquid studied with muon-spin relaxation

Physical Review B American Physical Society 95 (2017)

JS Möller, T Lancaster, S Blundell, FL Pratt, PJ Baker, F Xiao, RC Williams, W Hayes, MM Turnbull, CP Landee

We demonstrate that quantum-critical spin dynamics can be probed in high magnetic fields using muon-spin relaxation (μ+SR). Our model system is the strong-leg spin ladder bis(2,3-dimethylpyridinium) tetrabromocuprate (DIMPY). In the gapless Tomonaga-Luttinger liquid phase we observe finite-temperature scaling of the μ+SR 1/T1 relaxation rate which allows us to determine the Luttinger parameter K. We discuss the benefits and limitations of local probes compared with inelastic neutron scattering.

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