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

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

研究成果: ジャーナルへの寄稿Conference article

7 引用 (Scopus)

抄録

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*.

元の言語英語
記事番号022044
ジャーナルJournal of Physics: Conference Series
200
発行部数SECTION 2
DOI
出版物ステータス出版済み - 1 1 2010
外部発表Yes

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clathrates
Curie temperature
crossovers
specific heat
anomalies
cooling
heat
magnetization
electrical resistivity
shift
single crystals
magnetic fields
ions

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

これを引用

Multiple ferromagnetic structures in an off-center rattling system Eu 8Ga16Ge30 . / Onimaru, Takahiro; Yamamoto, Shuhei; Avila, Marcos A.; Suekuni, Koichiro; Takabatake, Toshiro.

:: Journal of Physics: Conference Series, 巻 200, 番号 SECTION 2, 022044, 01.01.2010.

研究成果: ジャーナルへの寄稿Conference article

Onimaru, Takahiro ; Yamamoto, Shuhei ; Avila, Marcos A. ; Suekuni, Koichiro ; Takabatake, Toshiro. / Multiple ferromagnetic structures in an off-center rattling system Eu 8Ga16Ge30 :: Journal of Physics: Conference Series. 2010 ; 巻 200, 番号 SECTION 2.
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