Giant magnetic field dependence of the coupling between spin chains in BaCo2V2O8

Martin Klanjšek 1, 2 Mladen Horvatić 1 S. Krämer 1 S. Mukhopadhyay 1 H. Mayaffre 1 Claude Berthier 1 E. Canévet 3 Beatrice Grenier 4 Pascal Lejay 5 Edmond Orignac 6
1 LNCMI - Laboratoire national des champs magnétiques intenses - Grenoble
2 Solid State Physics Department
3 ILL - Institut Laue-Langevin
4 MDN - Magnétisme et Diffusion Neutronique
MEM - Modélisation et Exploration des Matériaux : DRF/IRIG/MEM
5 CrisMass - Cristaux Massifs
NEEL - Institut Néel
6 Phys-ENS - Laboratoire de Physique de l'ENS Lyon
Abstract : 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 to the transverse antiferromagnetic ordered phase, we find a sequence of three magnetically ordered phases between the critical fields 3.8 and 22.8 T. Their origin is traced to the giant magnetic field dependence of the total effective coupling between spin chains, found to vary by a factor of 24. We explain this interesting phenomenon as emerging from a combination of nontrivially coupled spin chains and incommensurate spin fluctuations in the chains treated as Tomonaga-Luttinger liquids.
Keywords : Nuclear Magnetic Resonance Tomonaga-Luttinger Liquid Commensurate incommensurate transition
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Journal articles
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https://hal-ens-lyon.archives-ouvertes.fr/ensl-01186120
Contributor : Edmond Orignac <>
Submitted on : Monday, August 24, 2015 - 2:03:19 PM
Last modification on : Tuesday, November 19, 2019 - 2:46:46 AM

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Martin Klanjšek, Mladen Horvatić, S. Krämer, S. Mukhopadhyay, H. Mayaffre, et al.. Giant magnetic field dependence of the coupling between spin chains in BaCo2V2O8. Physical Review B : Condensed matter and materials physics, American Physical Society, 2015, 92 (6), pp.060408(R). ⟨10.1103/PhysRevB.92.060408⟩. ⟨ensl-01186120⟩

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