Rare-earth fourth-order multipole moment in cubic ErCo2Probed by linear dichroism in core-level photoemission

Amina A. Abozeed, Toshiharu Kadono, Akira Sekiyama, Hidenori Fujiwara, Atsushi Higashiya, Atsushi Yamasaki, Yuina Kanai, Kohei Yamagami, Kenji Tamasaku, Makina Yabashi, Tetsuya Ishikawa, Alexander V. Andreev, Hirofumi Wada, Shin Imada

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1 Citation (Scopus)


We developed a method to experimentally quantify the fourth-order multipole moment of the rare-earth 4f orbital. Linear dichroism (LD) in the Er 3d5=2 core-level photoemission spectra of cubic ErCo2 was measured using bulk-sensitive hard X-ray photoemission spectroscopy. Theoretical calculation reproduced the observed LD, and the result showed that the observed result does not contradict the suggested38 ground state. Theoretical calculation further showed a linear relationship between the LD size and the size of the fourth-order multipole moment of the Er3+ ion, which is proportional to the expectation value hO04 þ 5O44i, where Omn are the Stevens operators. These analyses indicate that the LD in 3d photoemission spectra can be used to quantify the average fourth-order multipole moment of rare-earth atoms in a cubic crystal electric field.

Original languageEnglish
Article number033710
Journaljournal of the physical society of japan
Issue number3
Publication statusPublished - 2018

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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