Magneto-optics induced by the spin chirality in itinerant ferromagnet Nd₂Mo₂O₇

2005/07/19 by I. Kézsmárki, S. Onoda, Y. Taguchi +6 · 1 citation
Physics and Astronomy · #cond-mat.mtrl-sci #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.72.094427

published as Physical Review B 72, 094427 (2005) · 4 pages, 5 figures. submitted to Phys. Rev. B

arxiv created 2005/07/19 · arxiv updated 2016/08/16

Abstract

It is demonstrated both theoretically and experimentally that the spin chirality associated with a noncoplanar spin configuration produces a magneto-optical effect. Numerical study of the two-band Hubbard model on a triangle cluster shows that the optical Hall conductivity σ_xy(ω) is proportional to the spin chirality. The detailed comparative experiments on pyrochlore-type molybdates R₂Mo₂O₇ with R=Nd (Ising-like moments) and R=Gd (Heisenberg-like ones) clearly distinguishes the two mechanisms, i.e., spin chirality and spin-orbit interactions. It is concluded that for R=Nd, σ_xy(ω) is dominated by the spin chirality for the dc (ω=0) and the d → d incoherent intraband optical transitions between Mo atoms.

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