Skyrmion Lattice in a Doped Semiconductor
Münzer, W. · Neubauer, A. · Mühlbauer, S. · Franz, C. · Adams, T. · Jonietz, F. · Georgii, R. · Böni, P. · Pedersen, B. · Schmidt, M. · Rosch, A. · Pfleiderer, C.
Original · EN
We report a comprehensive small angle neutron scattering study (SANS) of the magnetic phase diagram of the doped semiconductor Fe₁₋ₓCoₓSi for x=0.2 and 0.25. For magnetic field parallel to the neutron beam we observe a six-fold intensity pattern under field-cooling, which identifies the A-phase of Fe₁₋ₓCoₓSi as a skyrmion lattice. The regime of the skyrmion lattice is highly hysteretic and extents over a wide temperature range, consistent with the site disorder of the Fe and Co atoms. Our study identifies Fe₁₋ₓCoₓSi is a second material after MnSi in which a skyrmion lattice forms and establishes that skyrmion lattices may also occur in strongly doped semiconductors.
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