Multiple ferromagnetic structures in an off-center rattling system Eu 8Ga16Ge30

Takahiro Onimaru, Shuhei Yamamoto, Marcos A. Avila, Koichiro Suekuni, Toshiro Takabatake

Research output: Contribution to journalConference article

7 Citations (Scopus)

Abstract

We performed electrical resistivity ρ, magnetization M and specific heat C measurements on single crystals of a type-I clathrate compound Eu 8Ga16Ge30, where the guest magnetic ions of Eu2+ in the tetrakaidecahedral cages are rattling among off-center positions. The jump of C at the Curie temperature TC is only one third of the value expected for a uniform ferromagnet with S=7/2 from the mean-field theory. Both ρ(T) and dM(T)/dT show broad humps at T*=20-24 K, where C(T) has no anomaly. With increasing magnetic fields to 5 T, the T* in ρ(T) shifts to 40 K. These observations indicate a crossover from a modulated structure to a uniform one on cooling through T*.

Original languageEnglish
Article number022044
JournalJournal of Physics: Conference Series
Volume200
Issue numberSECTION 2
DOIs
Publication statusPublished - 2010

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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