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Element-specific field-induced spin reorientation and an unusual tetracritical point in MnCr2S4

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arxiv 2008.13285 v3 pith:OG7NQ3CY submitted 2020-08-30 cond-mat.str-el

Element-specific field-induced spin reorientation and an unusual tetracritical point in MnCr2S4

Sh. Yamamoto , H. Suwa , T. Kihara , T. Nomura , Y. Kotani , T. Nakamura , Y. Skourski , S. Zherlitsyn
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L. Prodan V. Tsurkan H. Nojiri A. Loidl J. Wosnitza
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keywords magneticfield-inducedmncr2s4couplingphasephasespointspin-lattice
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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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