Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-02-11
Phys. Rev. Lett. 102, 186602 (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
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 suggest 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.
Binz Benedikt
Boni Peter
Neubauer A.
Niklowitz P. G.
Pfleiderer Ch.
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