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000399738 1001_ $$0P:(DE-HGF)0$$aPeter, Sebastian C.$$b0$$eCorresponding author
000399738 245__ $$a$\mathrm{Yb_{4}LiGe_{4}}$ – A Yb mixed valent Zintl phase with strong electronic correlations
000399738 260__ $$aLausanne$$bElsevier$$c2012
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000399738 520__ $$aSingle-phase samples of Yb$_{4}$LiGe$_{4}$ and Yb$_{5}$LiGe$_{4}$ were synthesized using high frequency (HF) heat treatment. Yb$_{4}$LiGe$_{4}$ crystallizes in orthorhombic space group Pnma with the Gd$_5$Si$_4$ type of crystal structure and lattice parameters a = 7.0828(3) Å, b = 14.6415(7) Å, and c = 7.6279(4) Å. One Yb position in Yb$_{5}$LiGe$_{4}$ is substituted by the lithium atom and causes a distortion of the germanium tetragons in Yb$_{4}$LiGe$_{4}$. Investigation of the electronic state of Yb via magnetic susceptibility and X-ray absorption near-edge spectroscopy (XANES) revealed a presence of two electronic states of ytterbium, 4f$^{13}$ and 4f$^{14}$ (mixed valence), in Yb$_{5}$LiGe$_{4}$ and Yb$_{4}$LiGe$_{4}$. Studies of the temperature dependence of the electrical resistivity, magnetization, 7Li spin-lattice relaxation rate and the specific heat indicate that strong electronic correlations are present in Yb$_{4}$LiGe$_{4}$, and below approximately 50 K there is a competition between ferromagnetic and antiferromagnetic correlations. Magnetic ordering in Yb$_{4}$LiGe$_{4}$, if present, occurs below the reported antiferromagnetic transition temperature of 1.7 K for Yb$_{5}$LiGe$_{4}$.
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000399738 7001_ $$aDisseler, Steven M.$$b1
000399738 7001_ $$aNiclas Svensson, J.$$b2
000399738 7001_ $$aCarretta, Pietro$$b3
000399738 7001_ $$0P:(DE-HGF)0$$aGraf, Michael J.$$b4
000399738 773__ $$0PERI:(DE-600)2012675-X$$a10.1016/j.jallcom.2011.11.148$$gVol. 516, p. 126 - 133$$p126 - 133$$tJournal of alloys and compounds$$v516$$x0925-8388$$y2012
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