Direct determination of the Tomonaga-Luttinger parameter K in quasi-one-dimensional spin systems
Abstract
We test the analytical formula for the enhancement of the nuclear magnetic resonance rate T1-1 by the critical spin fluctuations, over the simple power-law dependence predicted for a purely one-dimensional spin system, recently derived in the random phase approximation [M. Dupont et al., Phys. Rev. B 98, 094403 (2018), 10.1103/PhysRevB.98.094403]. This prediction is experimentally confirmed by excellent fits to the published temperature dependence of T1-1 data in the two representative spin compounds, (C7H10N) 2CuBr4 (DIMPY) and BaCo2V2O8 , providing at the same time a direct and convenient experimental determination of the Tomonaga-Luttinger-liquid parameter K , very well in agreement with theoretical predictions.
- Publication:
-
Physical Review B
- Pub Date:
- June 2020
- DOI:
- 10.1103/PhysRevB.101.220406
- arXiv:
- arXiv:2003.05904
- Bibcode:
- 2020PhRvB.101v0406H
- Keywords:
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- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- Main manuscript (5 pages, 4 figures) and Supplemental Material (3 pages, 2 figures), 8 pages, 6 figures in total