Incommensurate magnetism and possible skyrmion phase in the tetragonal Heusler system Mn2PtSn
In contrast to the known skyrmion-lattice compounds (e.g. B20 compounds or Cu2OSeO3, characterized by a chiral cubic structure), the Heusler system Mn2PtSn is tetragonal, crystallizing in the noncentrosymmetric I-42m structure. There are strong indications that it could exhibit a skyrmion-lattice phase, as follows from the observation of topological Hall effect in thin films of this material and Lorentz-microscopy images showing a pronounced magnetic spiral structure. If the skyrmion ordering is revealed directly in a diffraction experiment, it could become the first example of a skyrmion lattice in a tetragonal system, allowing for future studies of crystalline anisotropy effects on the spin texture under various directions of applied magnetic fields. Moreover, dc magnetic measurements indicate that a complex incommensurate magnetic state exists in our samples in a broad range of temperatures and magnetic fields, characterized by a spin-reorientation transition around 180 K, which requires SANS measurements to be clarified. We propose a systematic SANS study of the recently synthesized single-crystalline Mn2PtSn in magnetic fields < 1 tesla across the whole magnetic phase diagram.
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Dmytro Inosov; CAMERON Alistair; FELSER Claudia; HONECKER Dirk; NAYAK Ajaya Kumar; ONYKIIENKO Yevhen; ROESSLER Ulrich K. and Yuliia Tymoshenko. (2016). Incommensurate magnetism and possible skyrmion phase in the tetragonal Heusler system Mn2PtSn. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-32-819
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