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

doi:10.1021/ic301197w

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^*

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

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 language	English (US)
Pages (from-to)	10793-10799
Number of pages	7
Journal	Inorganic chemistry
Volume	51
Issue number	20
DOIs	https://doi.org/10.1021/ic301197w
State	Published - Oct 15 2012

ASJC Scopus subject areas

Inorganic Chemistry
Physical and Theoretical Chemistry

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

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) {\AA}, b = 14.730(3) {\AA}, c = 8.4995(17) {\AA}. 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.",

author = "Peter, {Sebastian C.} and Sumanta Sarkar and Kanatzidis, {Mercouri G.}",

year = "2012",

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T2 - An ordered superstructure in the AlB 2-type family with mixed-valent Yb and a high-temperature phase transition

AU - Peter, Sebastian C.

AU - Sarkar, Sumanta

AU - Kanatzidis, Mercouri G.

PY - 2012/10/15

Y1 - 2012/10/15

N2 - 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.

AB - 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.

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

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