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Topological Hall Effect in the A Phase of MnSi

A. Neubauer, C. Pfleiderer, B. Binz, A. Rosch, R. Ritz, P. G. Niklowitz, and P. Böni
Phys. Rev. Lett. 102, 186602 – Published 4 May 2009; Erratum Phys. Rev. Lett. 110, 209902 (2013)
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Abstract

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.

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  • Received 27 November 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.186602

©2009 American Physical Society

Erratum

Erratum: Topological Hall Effect in the A Phase of MnSi [Phys. Rev. Lett. 102, 186602 (2009)]

A. Neubauer, C. Pfleiderer, B. Binz, A. Rosch, R. Ritz, P. G. Niklowitz, and P. Böni
Phys. Rev. Lett. 110, 209902 (2013)

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A new twist in a ferromagnet

Published 4 May 2009

Transport measurements show evidence of a topologically nontrivial structure—a lattice of skyrmions—in intermetallic MnSi.

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Authors & Affiliations

A. Neubauer1, C. Pfleiderer1, B. Binz2, A. Rosch2, R. Ritz1, P. G. Niklowitz1, and P. Böni1

  • 1Physik Department E21, Technische Universität München, James-Franck-Strasse, D-85748 Garching, Germany
  • 2Institute for Theoretical Physics, Universität zu Köln, 50937 Cologne, Germany

See Also

Unusual Hall Effect Anomaly in MnSi under Pressure

Minhyea Lee, W. Kang, Y. Onose, Y. Tokura, and N. P. Ong
Phys. Rev. Lett. 102, 186601 (2009)

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Vol. 102, Iss. 18 — 8 May 2009

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