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Superconductivity at 18 K in yttrium sesquicarbide system, Y2C3

In this study, we investigated superconductivity at 18 K in an yttrium sesquicarbide system, Y2C3, by a magnetization measurement, although this material with a maximum Tc of 11.5 K has already been investigated by Krupka et al. in J. Less-Common Met. 17 (1969) 91. The crystal structure of Y2C3 is a...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2004, Vol.73 (3), p.530-532
Main Authors: AMANO, Gaku, AKUTAGAWA, Satoshi, MURANAKA, Takahiro, ZENITANI, Yuji, AKIMITSU, Jun
Format: Article
Language:English
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Summary:In this study, we investigated superconductivity at 18 K in an yttrium sesquicarbide system, Y2C3, by a magnetization measurement, although this material with a maximum Tc of 11.5 K has already been investigated by Krupka et al. in J. Less-Common Met. 17 (1969) 91. The crystal structure of Y2C3 is a body-centered cubic (Pu2C3-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, Hc1(0), is 3.5 mT. The Tc 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-Tc phase in Y2C3.
ISSN:0031-9015
1347-4073
DOI:10.1143/JPSJ.73.530