Complex magnetism and non-Fermi liquid state in the vicinity of the quantum critical point in the CeCo_1-xFe_xGe₃ series

2018/06/12 by P. Skokowski, Skokowski, P., K. Synoradzki +3
Physics and Astronomy · #FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.str-el

paper · pdf · doi:10.48550/arxiv.1806.04656

arxiv created 2018/06/12 · arxiv updated 2018/06/13

Abstract

We report extensive studies on the CeCo_1-xFe_xGe₃ alloys, which show quantum critical point (QCP) due to damping the antiferromagnetic order in CeCoGe₃ down to 0 K by doping with the paramagnetic CeFeGe₃ compound. The presence of QCP is confirmed by detecting the non-Fermi liquid behavior (NFL) using a wide range of the experimental methods: magnetic susceptibility, specific heat, electrical resistivity, magnetoresistance, and thermoelectric power. In the case of the thermoelectric power we find a clear enhancement of the Seebeck coefficient for x around 0.6, i.e. in the neighborhood of QCP. Finally, the different complementary studies enabled construction of the complex magnetic phase diagram for the CeCo_1-xFe_xGe₃ system, including the energy scale imposed by the crystal electric field splitting of the Ce ground state.

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