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

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arxiv 1209.6024 v1 pith:PFE3EC2F submitted 2012-09-26 cond-mat.str-el

B. G. Ueland , C. F. Miclea , Yasuyuki Kato , O. Ayala-Valenzuela , R. D. McDonald , R. Okazaki , P. H. Tobash , M. A. Torrez
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F. Ronning R. Movshovich Z. Fisk E. D. Bauer Ivar Martin J. D. Thompson
This is my paper · ORCID
classification cond-mat.str-el
keywords halleffectgeometricalhighly-correlatedmagneticcontrollableelectronsfield
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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. We show that the highly-correlated metal UCu5 possesses an unusually large controllable geometrical Hall effect at T<1.2K due to its frustration-induced magnetic order. The magnitude of the Hall response exceeds 20% of the \nu=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 UCu5 opens a new field of inquiry into the importance of the role of frustration in highly-correlated electron materials.

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