Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-01-19
Phys. Rev. B 80, 100401(R) (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages
Scientific paper
10.1103/PhysRevB.80.100401
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.
Kontani Hiroshi
Tomizawa Takeshi
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