Discovery and Characterization of Single Crystalline $R_{5}$Co$_{2}$Ge$_{3}$ ($R$ = Ce-Nd, Sm)

ORAL

Abstract

Single crystalline $R_{5}$Co$_{2}$Ge$_{3}$ ($R$ = Ce-Nd, Sm) were synthesized through flux-based crystal growth methods. In this work we analyze powder x-ray diffraction, electrical resistivity, magnetization, and specific heat of various members of the $R_{5}$Co$_{2}$Ge$_{3}$ family. We observe characteristic Lanthanide contraction as we increase 4f electron concentration. Magnetization measurements show an increase of transition temperature from $T_\textrm{c}$=6~K for Ce$_{5}$Co$_{2}$Ge$_{3}$ to $T_\textrm{N}$=220~K for Sm$_{5}$Co$_{2}$Ge$_{3}$, as well as other magnetic transitions upon change in temperature for various members of the family. The inferred effective moment is larger than expected from pure 4f electron contribution, suggesting contribution to the magnetization from Co in the system. Specific heat and electrical resistivity confirm the transition temperatures of the $R_{5}$Co$_{2}$Ge$_{3}$ series.

–

Authors

  • S. M. Saunders$^{a,b}$

    $^A$Ames Laboratory US DOE, $^B$Department of Physics and Astronomy, $^C$Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA.

  • Q. Lin$^a$

    $^A$Ames Laboratory US DOE, $^B$Department of Physics and Astronomy, $^C$Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA.

  • Tai Kong

    $^A$Ames Laboratory US DOE, $^B$Department of Physics and Astronomy, $^C$Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA., Iowa State Univ and Ames Laboratory

  • G. J. Miller$^{a,c}$

    $^A$Ames Laboratory US DOE, $^B$Department of Physics and Astronomy, $^C$Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA.

  • Serguei Budko

    Iowa State Univ Ames Laboratory, Iowa State Univ, $^A$Ames Laboratory US DOE, $^B$Department of Physics and Astronomy, $^C$Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA., Ames Laboratory US DOE, and Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA, Ames Laboratory, Dept. of Physics, ISU, Dept. of Physics, Washington University, St. Louis, ICQM, School of Physics, Peking University, Ames Laboratory and Dept. of Phys. and Astro., Iowa State University, Iowa State Univ and Ames Laboratory

  • Paul Canfield

    Iowa State Univ Ames Laboratory, Ames Laboratory/ Iowa State University, Ames, IA 50011, USA, Iowa State Univ, $^A$Ames Laboratory US DOE, $^B$Department of Physics and Astronomy, $^C$Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA., Iowa State University/ Ames LabLaboratory, Ames Lab, Ames Laboratory, Dept. of Physics and Astronomy, Iowa State University, Ames Laboratory and Dept. of Phys. and Astro., Iowa State University, Ames Laboratory and Department of Physics, Iowa State University, Ames, Iowa, Iowa State Univ and Ames Laboratory, Ames Lab and Department of Physics, Iowa State University, Ames, Iowa