Spin state of Co3+ in LaCo1-xRhxO 3investigated by structural phenomena

Shinichiro Asai, Ryuji Okazaki, Ichiro Terasaki, Yukio Yasui, Wataru Kobayashi, Akiko Nakao, Kensuke Kobayashi, Reiji Kumai, Hironori Nakao, Youichi Murakami, Naoki Igawa, Akinori Hoshikawa, Toru Ishigaki, Outi Parkkima, Maarit Karppinen, Hisao Yamauchi

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Neutron diffraction for a polycrystalline sample of LaCo 0:8Rh0:2O3 and synchrotron x-ray diffraction for polycrystalline samples of LaCo0:9RhO and LaCo RhO3 have been carried out in order to investigate the structural properties related with the spin state of Co3+ ions. We have found that the Co(Rh)-O bond lengths in the Co(Rh)O6 octahedron of LaCo0:8Rh0:2O3 are nearly identical at 10K. The lattice volume for the Rh3+ substituted samples decreases with the thermal expansion coefficient similar to that of LaCoO3from room temperature, and ceases to decrease around 70 K. These experimental results favor a mixed state consisting of the high-spin-state and low-spinstate Co 3+ ions, and suggest that there are thermally excited high-spin-state Co3+ ions in addition to those pinned by the substituted Rh 3+ ions.

Original languageEnglish
Article number114606
JournalJournal of the Physical Society of Japan
Volume82
Issue number11
DOIs
Publication statusPublished - 2013 Nov
Externally publishedYes

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ions
neutron diffraction
thermal expansion
synchrotrons
x ray diffraction
room temperature
coefficients

Keywords

  • LaCoRhO
  • Neutron diffraction
  • Spin crossover
  • Spin state
  • X-ray scattering

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Asai, S., Okazaki, R., Terasaki, I., Yasui, Y., Kobayashi, W., Nakao, A., ... Yamauchi, H. (2013). Spin state of Co3+ in LaCo1-xRhxO 3investigated by structural phenomena. Journal of the Physical Society of Japan, 82(11), [114606]. https://doi.org/10.7566/JPSJ.82.114606

Spin state of Co3+ in LaCo1-xRhxO 3investigated by structural phenomena. / Asai, Shinichiro; Okazaki, Ryuji; Terasaki, Ichiro; Yasui, Yukio; Kobayashi, Wataru; Nakao, Akiko; Kobayashi, Kensuke; Kumai, Reiji; Nakao, Hironori; Murakami, Youichi; Igawa, Naoki; Hoshikawa, Akinori; Ishigaki, Toru; Parkkima, Outi; Karppinen, Maarit; Yamauchi, Hisao.

In: Journal of the Physical Society of Japan, Vol. 82, No. 11, 114606, 11.2013.

Research output: Contribution to journalArticle

Asai, S, Okazaki, R, Terasaki, I, Yasui, Y, Kobayashi, W, Nakao, A, Kobayashi, K, Kumai, R, Nakao, H, Murakami, Y, Igawa, N, Hoshikawa, A, Ishigaki, T, Parkkima, O, Karppinen, M & Yamauchi, H 2013, 'Spin state of Co3+ in LaCo1-xRhxO 3investigated by structural phenomena', Journal of the Physical Society of Japan, vol. 82, no. 11, 114606. https://doi.org/10.7566/JPSJ.82.114606
Asai, Shinichiro ; Okazaki, Ryuji ; Terasaki, Ichiro ; Yasui, Yukio ; Kobayashi, Wataru ; Nakao, Akiko ; Kobayashi, Kensuke ; Kumai, Reiji ; Nakao, Hironori ; Murakami, Youichi ; Igawa, Naoki ; Hoshikawa, Akinori ; Ishigaki, Toru ; Parkkima, Outi ; Karppinen, Maarit ; Yamauchi, Hisao. / Spin state of Co3+ in LaCo1-xRhxO 3investigated by structural phenomena. In: Journal of the Physical Society of Japan. 2013 ; Vol. 82, No. 11.
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AU - Igawa, Naoki

AU - Hoshikawa, Akinori

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AU - Parkkima, Outi

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N2 - Neutron diffraction for a polycrystalline sample of LaCo 0:8Rh0:2O3 and synchrotron x-ray diffraction for polycrystalline samples of LaCo0:9RhO and LaCo RhO3 have been carried out in order to investigate the structural properties related with the spin state of Co3+ ions. We have found that the Co(Rh)-O bond lengths in the Co(Rh)O6 octahedron of LaCo0:8Rh0:2O3 are nearly identical at 10K. The lattice volume for the Rh3+ substituted samples decreases with the thermal expansion coefficient similar to that of LaCoO3from room temperature, and ceases to decrease around 70 K. These experimental results favor a mixed state consisting of the high-spin-state and low-spinstate Co 3+ ions, and suggest that there are thermally excited high-spin-state Co3+ ions in addition to those pinned by the substituted Rh 3+ ions.

AB - Neutron diffraction for a polycrystalline sample of LaCo 0:8Rh0:2O3 and synchrotron x-ray diffraction for polycrystalline samples of LaCo0:9RhO and LaCo RhO3 have been carried out in order to investigate the structural properties related with the spin state of Co3+ ions. We have found that the Co(Rh)-O bond lengths in the Co(Rh)O6 octahedron of LaCo0:8Rh0:2O3 are nearly identical at 10K. The lattice volume for the Rh3+ substituted samples decreases with the thermal expansion coefficient similar to that of LaCoO3from room temperature, and ceases to decrease around 70 K. These experimental results favor a mixed state consisting of the high-spin-state and low-spinstate Co 3+ ions, and suggest that there are thermally excited high-spin-state Co3+ ions in addition to those pinned by the substituted Rh 3+ ions.

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