Well-defined crystal field splitting schemes and non-kramers doublet ground states of f electrons in PrT2Zn20 (T = Ir, Rh, and Ru)

Kazuaki Iwasa, Hiroki Kobayashi, Takahiro Onimaru, Keisuke T. Matsumoto, Naohiro Nagasawa, Toshiro Takabatake, Seiko Ohira-Kawamura, Tatsuya Kikuchi, Yasuhiro Inamura, Kenji Nakajima

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47 Citations (Scopus)

Abstract

Inelastic neutron scattering studies of PrT2Zn20 (T = Ir, Rh, and Ru) were carried out in order to reveal f electron states indispensable for the low-temperature properties of PrT2Zn 20 associated with multipole degrees of freedom. Sharp excitation peaks, which are located within excitation energies of less than 10 meV, are attributed to crystal field splitting level schemes of 4f2 in Pr 3+ ions. Data of the Ir-based compound is explained by a non-Kramers doublet ground state in the local symmetry Td for this system. Results of the Rh-based compound are explained by the scheme for the Pr-site local cubic symmetry T in the low-temperature structural phase, which is lower than Td. In the Ru-based compound, the doublet is split as a result of the loss of local cubic symmetry through structural transformation. These experimental results confirm the non-Kramers doublet ground state that causes the quadrupole ordering or orbital Kondo effect predicted for this series of compounds.

Original languageEnglish
Article number043707
Journaljournal of the physical society of japan
Volume82
Issue number4
DOIs
Publication statusPublished - 2013 Apr

Keywords

  • Crystal-field splitting
  • Felectrons
  • Inelastic neutron scattering

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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