Effects of spin-orbit interaction in chromium on oxygen K-edge x-ray magnetic circular dichroism spectra in CrO2

Akihiro Koide and Toshihiko Yokoyama
Phys. Rev. B 96, 144419 – Published 17 October 2017

Abstract

We calculate the oxygen K-edge x-ray magnetic circular dichroism (XMCD) spectra of CrO2 to investigate the origin of light-element XMCD. The XMCD spectra evaluated by using a multiple scattering theory are interpreted in terms of the spin-orbit interaction (SOI) at each atomic site. We find that the SOI at the nearest-neighbor Cr atoms dominantly contributes to the oxygen K-edge XMCD. Since it has been speculated that XMCD originates from the spin polarization and the SOI at the x-ray-absorbing atom, the present finding may lead to modification of the previously speculated mechanism underlying K-edge XMCD. We also perform calculations with a small CrO2 cluster to examine how the O-p and Cr-d states are hybridized and how oxygen atoms acquire orbital angular momentum density. Strong K-edge XMCD features reflect the character of the d states of neighboring magnetic atoms and do not directly connect to the orbital magnetic moments of light-element p states.

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  • Received 19 June 2017
  • Revised 16 September 2017

DOI:https://doi.org/10.1103/PhysRevB.96.144419

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Akihiro Koide and Toshihiko Yokoyama

  • Department of Materials Molecular Science, Institute for Molecular Science, Myodiji-cho, Okazaki, 444-8585, Japan

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Issue

Vol. 96, Iss. 14 — 1 October 2017

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