Ordering and crossover in a pseudo-sextet localized electron model - Possible scenario for SmRu4P12 skutterudite

Annamária Kiss, Yoshio Kuramoto

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A crystalline electric field (CEF) model of localized 4f5 electrons is proposed for understanding intriguing ordering phenomena in SmRu4P12. We take the CEF quartet and doublet (pseudo-sextet) of the Hund's rule ground state with J = 5/2, and include intersite interactions between multipoles by the mean-field theory. The model leads to a multipole order with representation Γ5u, and shows the following features: (i) increasing transition temperature TMI with increasing magnetic field; (ii) an anomaly in specific heat and other thermodynamic quantities at lower temperature T*, (iii) sharpening of the anomaly at T* as the magnetic field increases. These behaviors reproduce salient features observed experimentally in SmRu4P12. Possible mechanisms for spontaneous magnetic moment are discussed.

Original languageEnglish
Article number124702
Journaljournal of the physical society of japan
Volume78
Issue number12
DOIs
Publication statusPublished - 2009 Dec 1

Keywords

  • Crystal-field
  • Multipole interactions
  • Skutterudite
  • Sm

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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