Article,

Element-specific field-induced spin reorientation and tetracritical point in MnCr$_2$S$_2$

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Phys. Rev. B, 103 (2): L020408 (Jan 25, 2021)
DOI: 10.1103/PhysRevB.103.L020408

Abstract

The ferrimagnetic spinel MnCr2S4 shows a variety of magnetic-field-induced phase transitions owing to bond frustration and strong spin-lattice coupling. However, the site-resolved magnetic properties at the respective field-induced phases in high magnetic fields remain elusive. Our soft x-ray magnetic circular dichroism studies up to 40 T directly evidence element-selective magnetic-moment reorientations in the field-induced phases. The complex magnetic structures are further supported by entropy changes extracted from magnetocaloric-effect measurements. Moreover, thermodynamic experiments reveal an unusual tetracritical point in the H−T phase diagram of MnCr2S4 due to strong spin-lattice coupling.

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