The Chiral Anomalous Hall Effect in re-entrant \underline {Au}Fe alloys.

POSTER

Abstract

The Hall Effect has been studied in a series of \underline {Au}Fe samples in the re-entrant concentration range, as well as in part of the spin glass range. The Hall coefficient has been measured in function of temperature and applied magnetic field. The present experimental data demonstrate that is indeed a negative contribution in addition to the canonical Karplus-Luttinger term. An anomalous Hall contribution linked to the tilting of the local spins can be identified, confirming theoretical predictions of a novel topological Hall term induced when chirality is present. This effect can be understood in terms of Aharonov-Bohm-like intrinsic current loops arising from successive scatterings by canted local spins. The experimental measurements indicate that the chiral signal persists, meaning scattering within the nanoscopic loops remains coherent, up to temperatures of the order of 150 K.

Authors

  • Frederik Fabris

    MPA-NHMFL, Los Alamos National Laboratory, MS E536, Los Alamos, New Mexico 87545, USA

  • Vivien Zapf

    National High Magnetic Field Lab, Los Alamos National Lab, Los Alamos, NM, MPA-NHMFL, Los Alamos National Laboratory, MS E536, Los Alamos, New Mexico 87545, USA

  • Alex Lacerda

    National High Magnetic Field Laboratory, Los Alamos National Laboratory, MPA-NHMFL, Los Alamos National Laboratory, MS E536, Los Alamos, New Mexico 87545, USA

  • Paulo Pureur

    Instituto de Fisica, Universidade Federal do Rio Grande do Sul, Caixa Postal 15051, 91501970, Porto Alegre, Brazil

  • Jacob Schaf

    Instituto de Fisica, Universidade Federal do Rio Grande do Sul, Caixa Postal 15051, 91501970, Porto Alegre, Brazil

  • Valdemar Vieira

    Instituto de Fisica, Universidade Federal do Rio Grande do Sul, Caixa Postal 15051, 91501970, Porto Alegre, Brazil

  • Ian Campbell

    Laboratoire des Colloides, Verres et Nanomateriaux, Universite Montpellier II, France