Metallic Yb 2AuGe 3: An ordered superstructure in the AlB 2-type family with mixed-valent Yb and a high-temperature phase transition

Sebastian C. Peter, Sumanta Sarkar, Mercouri G. Kanatzidis

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Abstract

The intermetallic compound Yb 2AuGe 3 was synthesized from indium flux. Yb 2AuGe 3 crystallizes in the orthorhombic Ca 2AgSi 3-type structure which is an ordered superstructure of the AlB 2 structure type. The structure was refined in the Fmmm space group with lattice parameters a = 8.5124(17) Å, b = 14.730(3) Å, c = 8.4995(17) Å. Temperature-dependent powder X-ray diffraction studies show that Yb 2AuGe 3 undergoes a phase transition from orthorhombic to hexagonal upon heating above 773 K. The compound shows weak paramagnetism that derives from a combination of Curie and Pauli paramagnetism with a magnetic moment value of 0.33(2) μ B/Yb atom. Magnetic ordering was not observed down to 2 K. Yb 2AuGe 3 is metallic, and at low temperature the resistivity varies as T 2, indicating possible Fermi liquid behavior. Heat capacity measurements suggest that Yb 2AuGe 3 is possibly a moderate heavy fermion system.

Original languageEnglish
Pages (from-to)10793-10799
Number of pages7
JournalInorganic Chemistry
Volume51
Issue number20
DOIs
Publication statusPublished - Oct 15 2012

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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