Field-driven spin-structure evolution in MnCr2S4 : A high-field single-crystal neutron-diffraction study
Résumé
We present a comprehensive microscopic insight into the spin configurations within the bondfrustrated cubic spinel compound MnCr2S4 directly unveiled through extensive single-crystal neutron diffraction studies carried out in zero magnetic field and in fields up to 35 T. While our zerofield results confirm the ferrimagnetic structure with an antiparallel arrangement of the magnetic Cr 3+ and Mn 2+ sublattices below TFiM ≈ 65 K, as well as the presence of the exotic Yafet-Kittel phase below TYK ≈ 5 K, our data measured in fields enable us to precisely determine the fieldinduced magnetic structures and their evolution across the phase transitions at µ0H1 ≈ 11 T and µ0H2 ≈ 25 T and beyond that towards µ0H3 (≈ 50 T). Additionally, combining our experimental findings with mean-field-theory calculations reveals a complex field dependence of the Mn-Mn and Mn-Cr exchange interactions across the different phases, highlighting the significant influence of spin-lattice coupling in this material.
Domaines
Physique [physics]| Origine | Fichiers produits par l'(les) auteur(s) |
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