Abstract
We demonstrate that quantum-critical spin dynamics can be probed in high magnetic fields using muon-spin relaxation (). 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 relaxation rate which allows us to determine the Luttinger parameter . We discuss the benefits and limitations of local probes compared with inelastic neutron scattering.
- Received 9 August 2016
DOI:https://doi.org/10.1103/PhysRevB.95.020402
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