Anomalous Hall Effect in $t_{2g}$ Orbital Kagome Lattice due to Non-collinearity:Significance of Orbital Aharonov-Bohm Effect

Abstract

A new mechanism of spin structure-driven anomalous Hall effect (AHE) in tilted ferromagnetic metals is proposed by taking account of the d-orbital degree of freedom. We find that a conduction electron acquires a Berry phase due to the complex d-orbital wavefunction, in the presence of non-collinear spin structure and the spin orbit interaction. The AHE driven by this orbital-derived Berry phase is much larger than the AHE induced by spin chirality, and it naturally explains the salient features of spin structure-driven AHE in pyrochlore Nd${}_2$Mo${}_2$O${}_7$. Since the proposed AHE can occur even for coplanar spin orders ($M_z=0$), it is expected to emerge in other interesting geometrically frustrated systems.

5 pages

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Cited by in corpus (2)

• Unconventional Anomalous Hall Effect in the Metallic Triangular-Lattice Magnet PdCrO2
• Quantum anomalous Hall states in the $p$-orbital honeycomb optical lattices