Hall effect measurements on epitaxial SmNiO3 thin films and implications for antiferromagnetism

Abstract

The rare-earth nickelates (RNiO3) exhibit interesting phenomena such as unusual antiferromagnetic order at wavevector q = (1/2, 0, 1/2) and a tunable insulator-metal transition that are subjects of active research. Here we present temperature-dependent transport measurements of the resistivity, magnetoresistance, Seebeck coefficient, and Hall coefficient (RH) of epitaxial SmNiO3 thin films with varying oxygen stoichiometry. We find that from room temperature through the high temperature insulator-metal transition, the Hall coefficient is hole-like and the Seebeck coefficient is electron-like. At low temperature the Néel transition induces a crossover in the sign of RH to electron-like, similar to the effects of spin density wave formation in metallic systems but here arising in an insulating phase ~200 K below the insulator-metal transition. We propose that antiferromagnetism can be stabilized by bandstructure even in insulating phases of correlated oxides, such as RNiO3, that fall between the limits of strong and weak electron correlation.

*Equally contributing first authors

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Cited by in corpus (9)

• Physics of ultrathin films and heterostructures of rare earth nickelates
• Origins of bad metal conductivity and the insulator-metal transition in the rare-earth nickelates
• Electrostatic gating of metallic and insulating phases in SmNiO3 ultrathin films
• Disentangled cooperative orderings in artificial rare-earth nickelates
• Anomalous electron transport in epitaxial NdNiO${}_3$ films
• Epitaxial strain modulated electronic properties of interface controlled nickelate superlattice
• From hidden metal-insulator transition to Planckian-like dissipation by tuning disorder in a nickelate
• Conductivity noise study of the insulator-metal transition and phase co-existence in epitaxial samarium nickelate thin films
• PERSPECTIVE: Emergent phases in rare earth nickelate heterostructures