Antiferromagnetic order of the Co $^{2+}$ high-spin state with a large orbital angular momentum in La $_{1.5}$ Ca $_{0.5}$ CoO $_{4}$

Okamoto, Jun*; Nakao, Hironori*; Yamasaki, Yuichi*; Wadachi, Hiroki*; Tanaka, Arata*; Kubota, Masato; Horigane, Kazumasa*; Murakami, Yoichi*; Yamada, Kazuyoshi*

The antiferromagnetic insulator La $_{1.5}$ Ca $_{0.5}$ CoO $_{4}$ has been investigated by Co L $_{2,3}$ -edge and O K-edge X-ray absorption spectroscopy (XAS) measurements and Co L $_{2,3}$ -edge resonant soft X-ray magnetic scattering (RXMS)measurement to determine the Co electronic structures associated with magnetic ordering. Co L $_{2,3}$ -edge linear-dichroic XAS shows that Co $^{2+}$ takes a high-spin (HS) state and Co $^{3+}$ takes a low-spin (LS) state. Using Co L $_{2,3}$ -edge RXMS, we directly determined that an antiferromagnetic order is formed with a HS state of Co $^{2+}$ ions. Moreover, the spin and orbital angular momenta of the Co $^{2+}$ HS state are quantitatively estimated to be 1.10.1 and 1.00.1, respectively, and to align parallel in the ab plane by utilizing the cluster model calculation. The large orbital angular momentum of the Co $^{2+}$ HS state originates from the small $D_{4h}$ -symmetry crystal field splitting of $t_{2g}$ levels, which is comparable with the spin-orbit coupling constant of the Co 3 orbital.

Language	:	English
Journal	:	Journal of the Physical Society of Japan
Volume	:	83
Number	:	4
Pages	:	p.044705_1 - 044705_6
Publication Year/Month	:	2014/04
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Paper URL	:	https://doi.org/10.7566/JPSJ.83.044705 Read or search this article
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Registration No. : AA20150397
JAEA Abstracts No. : 43001313
Paper Submission No. : 16401

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Antiferromagnetic order of the Co high-spin state with a large orbital angular momentum in LaCaCoO

Antiferromagnetic order of the Co $^{2+}$ high-spin state with a large orbital angular momentum in La $_{1.5}$ Ca $_{0.5}$ CoO $_{4}$