Giant magnetic-field dependence of the coupling between spin Tomonaga-Luttinger liquids in BaCo2V2O8
| Autor: | Klanjsek, M., Horvatic, M., Kramer, S., Mukhopadhyay, S., Mayaffre, H., Berthier, C., Canevet, E., Grenier, B., Lejay, P., Orignac, E. |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 92, 060408(R) (2015) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.92.060408 |
| Popis: | We use nuclear magnetic resonance to map the complete low-temperature phase diagram of the antiferromagnetic Ising-like spin-chain system BaCo2V2O8 as a function of the magnetic field applied along the chains. In contrast to the predicted crossover from the longitudinal incommensurate phase to the transverse antiferromagnetic phase, we find a sequence of three magnetically ordered phases between the critical fields 3.8 T and 22.8 T. Their origin is traced to the giant magnetic-field dependence of the total effective coupling between spin chains, extracted to vary by a factor of 24. We explain this novel phenomenon as emerging from the combination of nontrivially coupled spin chains and incommensurate spin fluctuations in the chains treated as Tomonaga-Luttinger liquids. Comment: 6 pages, 3 figures |
| Databáze: | arXiv |
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