Single Crystal Growth of R<SUB>3</SUB>Co (R: La, Pr and Nd) and Their Characteristic Transport Properties

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  • Lu Q. F.
    Department of Physics, Faculty of Engineering, Yokohama National University
  • Umehara I.
    Department of Physics, Faculty of Engineering, Yokohama National University
  • Adachi Y.
    Department of Physics, Faculty of Engineering, Yokohama National University
  • Sato K.
    Department of Physics, Faculty of Engineering, Yokohama National University

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  • Single Crystal Growth of R3Co(R:La,Pr and Nd)and Their Characteristic Transport Properties
  • Single Crystal Growth of R3Co R La Pr a

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We succeeded in growing the single crystals of R3Co (R: La, Pr and Nd), which possess the orthorhombic Fe3C type crystal structure. They were grown by the Bridgman method using a Tanman furnace with an alumina crucible in high vacuumed quartz tube. The size of ingot was 1.0×10−2 m in diameter and 2.0×10−2 m in length. For single crystalline La3Co, we observed the saturation phenomena in the electrical resistivity. The T2 dependence is observed below 20 K in the electrical resistivity, whose coefficient A is 2.9×10−10 Ωm/K2. The γ value of La3Co shows a fairly large value of 25×10−3 J/K2mol. We underline that the normal state of La3Co is characterized by the unconventionality of A⁄γ2 value of 0.46×10−6 Ωm (Kmol/J)2. For single crystalline Pr3Co, we also found the saturation phenomena and the T2 dependence in electrical resistivity. The coefficient A of 3.1×10−10 Ωm/K2 is close to that of La3Co. It suggests that the 3d band of cobalt plays an important role in the transport properties of R3Co compounds.

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