Phys. Rev. Lett. 102, 186601 (2009) [4 pages]

Unusual Hall Effect Anomaly in MnSi under Pressure

Abstract

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Minhyea Lee^1,*, W. Kang², Y. Onose³, Y. Tokura^3,4, and N. P. Ong¹
¹Department of Physics, Princeton University, Princeton, New Jersey 08544, USA
²Department of Physics, University of Chicago, Chicago, Illinois 60637, USA
³Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
⁴ERATO, JST, Spin Superstructure Project (SSS), Tsukuba 305-8562, Japan

Received 19 November 2008; published 4 May 2009

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We report the observation of a highly unusual Hall current in the helical magnet MnSi in an applied pressure P=6–12 kbars. The Hall conductivity displays a distinctive stepwise field profile quite unlike any other Hall response observed in solids. We identify the origin of this Hall current with the effective real-space magnetic field due to chiral spin textures, which may be a precursor of the partial-order state at P>14.6 kbar. We discuss evidence favoring the chiral spin mechanism for the origin of the observed Hall anomaly.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.102.186601

DOI:

10.1103/PhysRevLett.102.186601

PACS:

72.15.Gd, 72.25.Ba, 75.30.Kz, 75.45.+j

^*Present address : National Institute of Standards and Technology, Boulder, CO 80305, USA.

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Phys. Rev. Lett. 102, 186601 (2009) [4 pages]

Unusual Hall Effect Anomaly in MnSi under Pressure

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