title: Controllable chirality-induced geometrical Hall effect in a frustrated highly correlated metal.
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.
authors.affiliation: Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA. bgueland@lanl.gov
authors.forename: B G
authors.initials: BG
authors.lastname: Ueland
authors.forename: C F
authors.initials: CF
authors.lastname: Miclea
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Kato
authors.forename: O
authors.initials: O
authors.lastname: Ayala-Valenzuela
authors.forename: R D
authors.initials: RD
authors.lastname: McDonald
authors.forename: R
authors.initials: R
authors.lastname: Okazaki
authors.forename: P H
authors.initials: PH
authors.lastname: Tobash
authors.forename: M A
authors.initials: MA
authors.lastname: Torrez
authors.forename: F
authors.initials: F
authors.lastname: Ronning
authors.forename: R
authors.initials: R
authors.lastname: Movshovich
authors.forename: Z
authors.initials: Z
authors.lastname: Fisk
authors.forename: E D
authors.initials: ED
authors.lastname: Bauer
authors.forename: Ivar
authors.initials: I
authors.lastname: Martin
authors.forename: J D
authors.initials: JD
authors.lastname: Thompson