Spin lattice coupling and frustration in ZnCr2Se4 spinel
Cr-spinels with formula ZnCr2X4 (X = O, S, Se) are nice playgrounds to study spin frustration under the influence of spin-lattice coupling. In ZnCr2Se4, a helimagnetic (HM) ground state is stabilized below TN = 21 K, as a result of a competition between nearest-neighbor (NN) antiferromagnetic Cr-Cr direct exchange and next-NN ferromagnetic super-exchange. Applying pressure is an efficient way to tune this interaction scheme. Using the G6.1 (LLB), DMC (PSI) and D20 instruments, we have followed the suppression of the HM long-range order and have found that it collapses at P ~ 7 GPa. Concomitantly, it is gradually replaced by a partially-ordered (PO) phase with a low moment but very high TN (larger than 300 K), surviving up to the largest pressures (~ 9 GPa). In order to clarify the origin of this PO phase and get a solid basis for the analysis of our high-pressure data, we need to record ambient pressure PND patterns of our ZnCr2Se4 sample in the 1.5-300 K range. This will allow us determining the HM critical behavior (in the region of TN) and search for traces of diffuse scattering, precursor to the PO phase, between TN and the transition to a fully paramagnetic state.
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MARTIN Nicolas; Claire V. Colin; DEUTSCH Maxime; I. MIREBEAU and SADYKOV Ravil A.. (2020). Spin lattice coupling and frustration in ZnCr2Se4 spinel. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2803
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