Transport and magnetic properties of Ce$_{1-x}$La$_x$Cu$_2$Ge$_2$ single crystals

ORAL

Abstract

We present magnetic-susceptibility, resistivity, heat-capacity, and thermoelectric power measurements on single crystals of La-diluted Kondo lattice CeCu$_2$Ge$_2$. The results of these measurements show that the antiferromagnetic temperature $T_N$ is suppressed in almost linear fashion with increasing of La concentration. The magnetic order was observed from x=0 ($T_N$=4.15 K) up to x=0.80 where $T_N$=0.56 K with 0.38 K being the lowest base temperature in our measurements. The characteristic Kondo temperature was found to decrease from 4 K to 1 K rather slowly. For the lowest concentrations of La, the heat capacity was shown to follow the prediction of the Kondo-impurity model.

*Supported by the Department of Energy, Basic Energy Sciences under Contract No. DE-AC02-07CH11358 and the AFOSR -MURI grant No. FA9550-09-1-0603.

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Authors

  • Halyna Hodovanets

    • Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, IA
    • Ames Laboratory and Dept. of Physics and Astronomy, Iowa State University

  • Sergey L. Bud'ko

    • Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, IA

  • Valentin Taufour

    • Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, IA

  • Hyunsoo Kim

    • Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, IA

  • Warren E. Straszheim

    • Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, IA

  • Paul C. Canfield

    • Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, IA