Magnetic and Electronic Properties of Eu₄Sr₄Ga₁₆Ge₃₀

Author

Gerald T. Woods
Joshua B. Martin
Matthew Beekman
Raphäel P. Hermann
Fernande Grandjean, Missouri University of Science and TechnologyFollow
Veerle M. Keppens
Olaf Leupold
Gary J. Long, Missouri University of Science and TechnologyFollow
George S. Nolas

Abstract

Magnetization, static and ac magnetic susceptibility, nuclear forward scattering, and electrical resistivity measurements have been performed on polycrystalline Eu₄Sr₄Ga₁₆Ge₃₀, a type I clathrate that has divalent strontium and europium ions encapsulated within a Ga-Ge framework. These data are compared with those of type I clathrates Eu₈Ga₁₆Ge₃₀ and Eu₆Sr₂Ga₁₆Ge₃₀. The ferromagnetic ordering of these Eu-containing clathrates is substantially altered by the incorporation of strontium, as compared to Eu₈Ga₁₆Ge₃₀. Ferromagnetism, accompanied by a relatively large negative magnetoresistance, is observed below 15 and 20 K in Eu₄Sr₄Ga₁₆Ge₃₀ and Eu₆Sr₂Ga₁₆Ge₃₀, respectively. An effective magnetic moment of 7.83 µB per Eu ion is observed above 30 K for Eu₄Sr₄Ga₁₆Ge₃₀, a moment which is close to the free-ion moment of 7.94 µB per europium(II) ion.

Recommended Citation

G. T. Woods et al., "Magnetic and Electronic Properties of Eu₄Sr₄Ga₁₆Ge₃₀," Physical review B: Condensed matter and materials physics, vol. 73, no. 17, American Physical Society (APS), May 2006.

The definitive version is available at https://doi.org/10.1103/PhysRevB.73.174403

Department(s)

Chemistry

International Standard Serial Number (ISSN)

1098-0121

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2006 American Physical Society (APS), All rights reserved.

Publication Date

01 May 2006