Normal and intrinsic anomalous Hall effect in Nb1-yFe2+y

Abstract

The Hall effect on selected samples of the dilution series Nb1-yFe2+y is studied. Normal and anomalous contributions are observed, with positive normal Hall effect dominating at high temperatures. Consistent analysis of the anomalous contribution is only possible for Fe-rich Nb0.985Fe2.015 featuring a ferromagnetic ground state. Here, a positive normal Hall coefficient is found at all temperatures with a moderate maximum at the spin-density-wave transition. The anomalous Hall effect is consistent with an intrinsic (Berry-phase) contribution which is constant below the ordering temperature TC and continuously vanishes above TC. For stoichiometric NbFe2 and Nb-rich Nb1.01Fe1.99 - both having a spin-density-wave ground state - an additional contribution to the Hall resistivity impedes a complete analysis and indicates the need for more sophisticated models of the anomalous Hall effect in itinerant antiferromagnets.

6 pages 5 figures

References in corpus (8)

• Anomalous Hall effect
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• First Principles Calculation of Anomalous Hall Conductivity in Ferromagnetic bcc Fe
• Fermi-surface collapse and dynamical scaling near a quantum critical point
• The anomalous Hall Effect and magnetoresistance in the layered ferromagnet Fe_{1/4}TaS_2: the inelastic regime
• Magnetism in Nb(1-y)Fe(2+y) - composition and magnetic field dependence
• Chemically-Mediated quantum criticality in NbFe_2
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• Spectroscopic study of the magnetic ground state of Nb${}_{1-y}$Fe${}_{2+y}$
• Anti-site disorder and Berry curvature driven anomalous Hall effect in spin gapless semiconducting Mn2CoAl Heusler compound
• Magnetic critical behavior and anomalous Hall effect in 2H-Co${}_{0.22}$TaS${}_2$ single crystals
• Muon spin rotation and relaxation study on Nb${}_{1-y}$Fe${}_{2+y}$
• Dynamic, magnetic and electronic properties of the C14 Laves phase Nb0.975Fe2.025 compound: Mössbauer-effect study