Rare- earth fourth-order multipole moment in cubic ErCo.sub.2./sub. probed by linear dichroism in core-level photoemission

0489935 - FZÚ 2019 RIV JP eng J - Journal Article
Abozeed, A.A. - Kadono-Okuda, K. - Sekiyama, A. - Fujiwara, H. - Higashiya, A. - Yamasaki, A. - Kanai, Y. - Yamagami, K. - Tamasaku, K. - Yabashi, M. - Ishikawa, T. - Andreev, Alexander V. - Wada, H. - Imada, S.
Rare- earth fourth-order multipole moment in cubic ErCo₂ probed by linear dichroism in core-level photoemission.
Journal of the Physical Society of Japan. Roč. 87, č. 3 (2018), s. 1-5, č. článku 033710. ISSN 0031-9015
R&D Projects: GA ČR GA16-03593S
Institutional support: RVO:68378271
Keywords : rare-earth intermetallics * ferrimagnetism * linear dichroism
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 1.570, year: 2018

We developed a method to experimentally quantify the fourth-order multipole moment of the rare-earth 4f orbital. Linear dichroism (LD) in the Er 3d(5/2) 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 suggested Gamma(3)(8) 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 < O-4(0) + 5O(4)(4)>, where O-n(m) 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.
Permanent Link: http://hdl.handle.net/11104/0284233