Title: Magnetic, Transport and Thermal Properties of Half-Heusler Compounds ErPdSb and YPdSB
Citation: PHYSICAL REVIEW B vol. 75 p. 224426-1 224426-11
Publication Year: 2007
JRC N°: JRC37947
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC37947
Type: Articles in periodicals and books
Abstract: The half-Heusler compounds ErPdSb and YPdSb were studied by means of x-ray diffraction, magnetic susceptibility, electrical resistivity, magnetoresistivity, thermoelectric power, Hall effect, thermal conductivity, and specific heat measurements, performed in the temperature range 1.5–300 K and in magnetic fields up to 12 T. The Er-based compound is a paramagnet down to 1.7 K and shows localized magnetism of Er3+ ions, while YPdSb exhibits a weak diamagnetic behavior. The crystal field effect in ErPdSb brings about a distinct Schottky anomaly in the specific heat. The total splitting of the erbium 4I15/2 multiplet in a cubic crystal field potential is of the order of 200 K, with a doublet being the ground state. Electrical properties of ErPdSb and YPdSb are governed by the formation of narrow gaps in the electronic band structures very close to the Fermi level. The Hall effect measured for ErPdSb indicates a complex electronic structure with multiple electron and hole bands with different temperature and magnetic field variations of carrier concentrations and mobilities. The thermal conductivity of ErPdSb is relatively low and dominated by the phonon contribution. At room temperature the Seebeck coefficient is of order 150 V/K for Er- and 200 V/K for Y-based compound, respectively, making these materials promising candidates for thermoelectric applications. This conjecture is supported by the value of the figure of merit of ErPdSb, which is about 0.15 at room temperature.
JRC Directorate:Nuclear Safety and Security

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