Neubauer, A., Pfleiderer, C., Binz, B., Rosch, A., Ritz, R., Niklowitz, P. G. and Böni, P. (2009) Topological Hall Effect in the A Phase of MnSi. Physical Review Letters, 102 (18).
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Recent small angle neutron scattering suggests that the spin structure in the A phase of MnSi is a so-called triple-Q state, i.e., a superposition of three helices under 120 degrees. Model calculations indicate that this structure in fact is a lattice of so-called Skyrmions, i.e., a lattice of topologically stable knots in the spin structure. We report a distinct additional contribution to the Hall effect in the temperature and magnetic field range of the proposed Skyrmion lattice, where such a contribution is neither seen nor expected for a normal helical state. Our Hall effect measurements constitute a direct observation of a topologically quantized Berry phase that identifies the spin structure seen in neutron scattering as the proposed Skyrmion lattice.
This is a Approved version This version's date is: 8/5/2009 This item is not peer reviewed
https://repository.royalholloway.ac.uk/items/9775ba67-618f-2130-0a0b-2f002c8d17fb/5/
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