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Single-phase samples of Yb4LiGe4 and Yb5Ge4 were synthesized using highfrequency (HF) heat treatment. Yb4LiGe4 crystallizes in orthorhombic spacegroup Pnma with the Gd5Si4 type of crystal structure and lattice parameters a =7.0571(1) Angs, b = 14.6239(1) Angs, and c = 7.6155(1) Angs. One Yb position inYb5Ge4 is substituted by the lithium atom and causes a distortion of thegermanium tetragons in Yb4LiGe4. Investigation of the electronic state of Ybvia magnetic susceptibility and X-ray absorption near-edge spectroscopy (XANES)revealed a presence of two electronic states of ytterbium, 4f13 and 4f14 (mixedvalence), in Yb5Ge4 and Yb4LiGe4. Studies of the temperature dependence of theelectrical resistivity, magnetization, 7Li spin-lattice relaxation rate and thespecific heat indicate that strong electronic correlations are present inYb4LiGe4, and below approximately 50 K there is a competition betweenferromagnetic and antiferromagnetic correlations. Magnetic ordering inYb4LiGe4, if present, occurs below the reported antiferromagnetic transitiontemperature of 1.7 K for Yb5Ge4.

Yb4LiGe4 - A Yb Mixed Valent Zintl Phase with Strong Electronic Correlations