Saturation of the Anomalous Hall Effect in Critically Disordered Ultra-thin CNi3 Films

Abstract

We demonstrate that a distinct high-disorder anomalous Hall effect phase emerges at the correlated insulator threshold of ultra-thin, amorphous, ferromagnetic CNi3 films. In the weak localization regime, where the sheet conductance G >> e^2/h, the anomalous Hall resistance of the films increases with increasing disorder and the Hall conductance scales as Gxy ~ G^1.6. However, at sufficiently high disorder the system begins to enter the 2D correlated insulator regime, at which point the Hall resistance Rxy abruptly saturates and the scaling exponent becomes 2. Tunneling measurements show that the saturation behavior is commensurate with the emergence of the 2D Coulomb gap, suggesting that e-e interactions mediate the high-disorder phase.

6 pages, 4 figures, to appear in PRL

References in corpus (7)

• Universal Scaling Behavior of Anomalous Hall Effect and Anomalous Nernst Effect in Itinerant Ferromagnets
• Quantum transport theory of anomalous electric, thermoelectric, and thermal Hall effects in ferromagnets
• Coulomb Gap: How a Metal Film Becomes an Insulator
• Intrinsic anomalous Hall effect in ferromagnetic metals studied by the multi d-orbital tight-binding model
• Weak localization correction to the anomalous Hall effect in polycrystalline Fe films
• Itinerant Ferromagnetism in the electronic localization limit
• Measurement of Conduction Electron Polarization Via the Pairing Resonance

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• Anomalous Hall effect in L10-MnAl films with controllable orbital two-channel Kondo effect
• Absence of the Ordinary and Extraordinary Hall effects scaling in granular ferromagnets at metal-insulator transition
• Temperature Dependence of the Anomalous Hall Effect from Electron Interactions
• Diffuson contribution to anomalous Hall effect in disordered Co2FeSi thin films
• Electrical Transport of perpendicularly magnetized L10-MnGa and MnAl films
• Electrical Conductivity in Quantum Materials