Journal Article

PUBDB-2018-00890

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png $\mathrm{Yb_{4}LiGe_{4}}$ – A Yb mixed valent Zintl phase with strong electronic correlations

Peter, S. C. (Corresponding author) ; Disseler, S. M. ; Niclas Svensson, J. ; Carretta, P. ; Graf, M. J.

2012
Elsevier Lausanne

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Please use a persistent id in citations: doi:10.1016/j.jallcom.2011.11.148

Abstract: Single-phase samples of Yb$_{4}$LiGe$_{4}$ and Yb$_{5}$LiGe$_{4}$ were synthesized using high frequency (HF) heat treatment. Yb$_{4}$LiGe$_{4}$ crystallizes in orthorhombic space group Pnma with the Gd$_5$Si$_4$ type of crystal structure and lattice parameters a = 7.0828(3) Å, b = 14.6415(7) Å, and c = 7.6279(4) Å. One Yb position in Yb$_{5}$LiGe$_{4}$ is substituted by the lithium atom and causes a distortion of the germanium tetragons in Yb$_{4}$LiGe$_{4}$. Investigation of the electronic state of Yb via magnetic susceptibility and X-ray absorption near-edge spectroscopy (XANES) revealed a presence of two electronic states of ytterbium, 4f$^{13}$ and 4f$^{14}$ (mixed valence), in Yb$_{5}$LiGe$_{4}$ and Yb$_{4}$LiGe$_{4}$. Studies of the temperature dependence of the electrical resistivity, magnetization, 7Li spin-lattice relaxation rate and the specific heat indicate that strong electronic correlations are present in Yb$_{4}$LiGe$_{4}$, and below approximately 50 K there is a competition between ferromagnetic and antiferromagnetic correlations. Magnetic ordering in Yb$_{4}$LiGe$_{4}$, if present, occurs below the reported antiferromagnetic transition temperature of 1.7 K for Yb$_{5}$LiGe$_{4}$.

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Contributing Institute(s):

1. DOOR-User (DOOR)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

Experiment(s):

1. DORIS Beamline E4 (DORIS III)

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Database coverage:
; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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