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

Möller, J.S.; Lancaster, T.; Blundell, S.J.; Pratt, F.L.; Baker, P.J.; Xiao, F.; Williams, R.C.; Hayes, W.; Turnbull, M.M.; Landee, C.P.

Abstract

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.

Citation

Möller, J., Lancaster, T., Blundell, S., Pratt, F., Baker, P., Xiao, F., …Landee, C. (2017). Quantum-critical spin dynamics in a Tomonaga-Luttinger liquid studied with muon-spin relaxation. Physical Review B, 95(2), Article 020402(R). https://doi.org/10.1103/physrevb.95.020402

• Journal Article Type: Article
• Acceptance Date: Dec 12, 2016
• Online Publication Date: Jan 3, 2017
• Publication Date: Jan 3, 2017
• Deposit Date: Jan 6, 2017
• Publicly Available Date: Jan 18, 2017
• Journal: Physical Review B
• Print ISSN: 2469-9950
• Electronic ISSN: 2469-9969
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 95
• Issue: 2
• Article Number: 020402(R)
• DOI: https://doi.org/10.1103/physrevb.95.020402
• Public URL: https://durham-repository.worktribe.com/output/1366923
• Related Public URLs: https://arxiv.org/abs/1608.05059