Magneto-optical effect induced by spin chirality of the itinerant ferromagnet Nd2Mo2O7

I. Kézsmárki, S. Onoda, Y. Taguchi, T. Ogasawara, M. Matsubara, S. Iguchi, N. Hanasaki, N. Nagaosa, and Y. Tokura
Phys. Rev. B 72, 094427 – Published 21 September 2005

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 σxy(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,σxy(ω) is dominated by the spin chirality for the dc (ω=0) and the dd incoherent intraband optical transitions between Mo atoms.

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  • Received 27 May 2005

DOI:https://doi.org/10.1103/PhysRevB.72.094427

©2005 American Physical Society

Authors & Affiliations

I. Kézsmárki1, S. Onoda2, Y. Taguchi3, T. Ogasawara4, M. Matsubara1, S. Iguchi1, N. Hanasaki1, N. Nagaosa1,4, and Y. Tokura1,2,4

  • 1Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
  • 2Spin Superstructure Project, ERATO, Japan Science and Technology Agency, c/o Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
  • 3Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
  • 4Correlated Electron Research Center (CERC), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8562, Japan

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Issue

Vol. 72, Iss. 9 — 1 September 2005

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