RKKY interactions and anomalous Hall effect in metallic rare-earth pyrochlores

Abstract

Motivated by experiments on Pr2Ir2O7, we consider metallic pyrochlore systems A2B2O7, where the A-sites are occupied by rare-earth local moments and the B-sites host 5d transition metal ions with itinerant strongly spin-orbit coupled electrons. Assuming non-Kramers doublets on the A-site, we derive the RKKY interaction between them mediated by the B-site itinerant electrons and find extended non-Heisenberg interactions. Analyzing a simplified model of the RKKY interaction, we uncover a local moment phase with coexisting spiral Ising-like magnetic dipolar and XY-like quadrupolar ordering. This state breaks time-reversal and lattice symmetries, and reconstructs the B-site electronic band structure, producing a Weyl Metallic phase with an intrinsic anomalous Hall effect and an undetectably small magnetization. We discuss implications of our results for Pr2Ir2O7.

5++ pages, 3 figures

References in corpus (5)

• Generic quantum spin ice
• Correlation effects on 3D topological phases: from bulk to boundary
• Magnetic orders and topological phases from f-d exchange in pyrochlore iridates
• Chiral RKKY interaction in Pr2Ir2O7
• Fractionalized topological insulators from frustrated spin models in three dimensions

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