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<p>We have conduct <sup>193</sup>Ir synchrotron-radiation-based Mössbauer spectroscopy of Ca<sub>5</sub>Ir<sub>3</sub>O<sub>12</sub> at various temperatures. Thanks to availability for <sup>193</sup>Ir Mössbauer spectroscopy in wide temperature range, we revealed successive transitions at 105 and 7.8&#xa0;K in Ca<sub>5</sub>Ir<sub>3</sub>O<sub>12</sub> on microscopic viewpoints. The transition at 105&#xa0;K involved a change in the Ir valence states. The combination of <sup>193</sup>Ir Mössbauer spectroscopy and neutron diffraction experiments reveals that the transition at 7.8&#xa0;K is magnetic despite of absence of magnetic dipoles. Furthermore, ab initio calculation provides crucial insight into hyperfine interactions at <sup>193</sup>Ir nuclei.</p>

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Successive transitions in Ca5Ir3O12 revealed by 193Ir synchrotron-radiation-based Mössbauer spectroscopy

  • 期刊论文

  • 发表日期：

    2026年1月3日

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  • Satoshi Tsutsui,
  • Hiroki Hanate,
  • Keisuke Kadohiro,
  • Takashi Honda,
  • Ryo Masuda,
  • Nobumoto Nagasawa,
  • Yoshitaka Yoda,
  • Satoru Hayami,
  • Hisatomo Harima,
  • Kazuyuki Matsuhira

摘要

We have conduct 193Ir synchrotron-radiation-based Mössbauer spectroscopy of Ca5Ir3O12 at various temperatures. Thanks to availability for 193Ir Mössbauer spectroscopy in wide temperature range, we revealed successive transitions at 105 and 7.8 K in Ca5Ir3O12 on microscopic viewpoints. The transition at 105 K involved a change in the Ir valence states. The combination of 193Ir Mössbauer spectroscopy and neutron diffraction experiments reveals that the transition at 7.8 K is magnetic despite of absence of magnetic dipoles. Furthermore, ab initio calculation provides crucial insight into hyperfine interactions at 193Ir nuclei.