Antiferromagnetic order of the Co2+ high-spin state with a large orbital angular momentum in La1.5Ca0.5CoO4

Jun Okamoto, Hironori Nakao, Yuichi Yamasaki, Hiroki Wadati, Arata Tanaka, Masato Kubota, Kazumasa Horigane, Youichi Murakami, Kazuyoshi Yamada

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The antiferromagnetic insulator La1.5Ca0.5CoO 4 has been investigated by Co L2,3-edge and O K-edge X-ray absorption spectroscopy (XAS) measurements and Co L2,3-edge resonant soft X-ray magnetic scattering (RXMS) measurement to determine the Co electronic structures associated with magnetic ordering. Co L2,3-edge linear-dichroic XAS shows that Co2+ takes a high-spin (HS) state and Co3+ takes a low-spin (LS) state. Using Co L2,3-edge RXMS, we directly determined that an antiferromagnetic order is formed with a HS state of Co2+ ions. Moreover, the spin and orbital angular momenta of the Co2+ HS state are quantitatively estimated to be 1.1 ± 0.1 and 1.0 ± 0.1, respectively, and to align parallel in the ab plane by utilizing the cluster model calculation. The large orbital angular momentum of the Co2+ HS state originates from the small D4h -symmetry crystal field splitting of t2g levels, which is comparable with the spin-orbit coupling constant of the Co 3d orbital.

Original languageEnglish
Article number044705
JournalJournal of the Physical Society of Japan
Volume83
Issue number4
DOIs
Publication statusPublished - Apr 15 2014
Externally publishedYes

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angular momentum
orbitals
absorption spectroscopy
x rays
scattering
crystal field theory
insulators
electronic structure
orbits
symmetry
ions

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Antiferromagnetic order of the Co2+ high-spin state with a large orbital angular momentum in La1.5Ca0.5CoO4 . / Okamoto, Jun; Nakao, Hironori; Yamasaki, Yuichi; Wadati, Hiroki; Tanaka, Arata; Kubota, Masato; Horigane, Kazumasa; Murakami, Youichi; Yamada, Kazuyoshi.

In: Journal of the Physical Society of Japan, Vol. 83, No. 4, 044705, 15.04.2014.

Research output: Contribution to journalArticle

Okamoto, Jun ; Nakao, Hironori ; Yamasaki, Yuichi ; Wadati, Hiroki ; Tanaka, Arata ; Kubota, Masato ; Horigane, Kazumasa ; Murakami, Youichi ; Yamada, Kazuyoshi. / Antiferromagnetic order of the Co2+ high-spin state with a large orbital angular momentum in La1.5Ca0.5CoO4 . In: Journal of the Physical Society of Japan. 2014 ; Vol. 83, No. 4.
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AU - Okamoto, Jun

AU - Nakao, Hironori

AU - Yamasaki, Yuichi

AU - Wadati, Hiroki

AU - Tanaka, Arata

AU - Kubota, Masato

AU - Horigane, Kazumasa

AU - Murakami, Youichi

AU - Yamada, Kazuyoshi

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N2 - The antiferromagnetic insulator La1.5Ca0.5CoO 4 has been investigated by Co L2,3-edge and O K-edge X-ray absorption spectroscopy (XAS) measurements and Co L2,3-edge resonant soft X-ray magnetic scattering (RXMS) measurement to determine the Co electronic structures associated with magnetic ordering. Co L2,3-edge linear-dichroic XAS shows that Co2+ takes a high-spin (HS) state and Co3+ takes a low-spin (LS) state. Using Co L2,3-edge RXMS, we directly determined that an antiferromagnetic order is formed with a HS state of Co2+ ions. Moreover, the spin and orbital angular momenta of the Co2+ HS state are quantitatively estimated to be 1.1 ± 0.1 and 1.0 ± 0.1, respectively, and to align parallel in the ab plane by utilizing the cluster model calculation. The large orbital angular momentum of the Co2+ HS state originates from the small D4h -symmetry crystal field splitting of t2g levels, which is comparable with the spin-orbit coupling constant of the Co 3d orbital.

AB - The antiferromagnetic insulator La1.5Ca0.5CoO 4 has been investigated by Co L2,3-edge and O K-edge X-ray absorption spectroscopy (XAS) measurements and Co L2,3-edge resonant soft X-ray magnetic scattering (RXMS) measurement to determine the Co electronic structures associated with magnetic ordering. Co L2,3-edge linear-dichroic XAS shows that Co2+ takes a high-spin (HS) state and Co3+ takes a low-spin (LS) state. Using Co L2,3-edge RXMS, we directly determined that an antiferromagnetic order is formed with a HS state of Co2+ ions. Moreover, the spin and orbital angular momenta of the Co2+ HS state are quantitatively estimated to be 1.1 ± 0.1 and 1.0 ± 0.1, respectively, and to align parallel in the ab plane by utilizing the cluster model calculation. The large orbital angular momentum of the Co2+ HS state originates from the small D4h -symmetry crystal field splitting of t2g levels, which is comparable with the spin-orbit coupling constant of the Co 3d orbital.

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