Superconductivity at 18K in Yttrium Sesquicarbide System, Y_2C_3 (Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)

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In this study, we investigated superconductivity at 18 K in an yttrium sesquicarbide system, Y_2C_3, by a magnetization measurement, although this material with a maximum T_c of 11.5 K has already been investigated by Krupka et al. in J. Less-Common Met. 17 (1969) 91. The crystal structure of Y_2C_3 is a body-centered cubic (Pu_2C_3-type) structure, and the lattice parameters are varied by heat treatment conditions. The magnetization (M-H) curves of this compound show a typical type-II superconducting behavior, and the lower critical field, H_<cl>(0), is 3.5mT. The T_c value in this system is changed in the range from 15 K to 18 K, depending on sintering conditions. The sintering conditions in this work are different from those in a previous work by Krupka et al. We successfully synthesized a new high-T_c phase in Y_2C_3.
社団法人日本物理学会の論文
2004-03-15