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Controllable chirality-induced geometrical Hall effect in a frustrated highly correlated metal

  • Author(s): Ueland, BG
  • Miclea, CF
  • Kato, Y
  • Ayala-Valenzuela, O
  • McDonald, RD
  • Okazaki, R
  • Tobash, PH
  • Torrez, MA
  • Ronning, F
  • Movshovich, R
  • Fisk, Z
  • Bauer, ED
  • Martin, I
  • Thompson, JD
  • et al.
Abstract

A current of electrons traversing a landscape of localized spins possessing non-coplanar magnetic order gains a geometrical (Berry) phase, which can lead to a Hall voltage independent of the spin-orbit coupling within the material-a geometrical Hall effect. Here we show that the highly correlated metal UCu 5 possesses an unusually large controllable geometrical Hall effect at T<1.2 K due to its frustration-induced magnetic order. The magnitude of the Hall response exceeds 20% of the ν=1 quantum Hall effect per atomic layer, which translates into an effective magnetic field of several hundred Tesla acting on the electrons. The existence of such a large geometric Hall response in UCu 5 opens a new field of enquiry into the importance of the role of frustration in highly correlated electron materials. ©2012 Macmillan Publishers Limited. All rights reserved.

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