Growth and characterization of superconductive Nd2-xCexCuO4-y single crystals by L. S. Jia, X. L. Chen, W. Yang, and X. L. Yan

Crystal Research and Technology

Cryst. Res. Technol. 39, 567 (2004) - Abstract -

Growth and characterization of superconductive Nd_2-xCe_xCuO_4-y single crystals

L. S. Jia, X. L. Chen, W. Yang*, and X. L. Yan

Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, P. R. China
*Department of Physics, Beihang University, Beijing 100080, P. R. China

Keywords	Nd_2-xCe_xCuO_4-y single crystals, traveling-solvent floating zone method, superconductivity
PACS	81.10.Fq, 74.72.-h
DOI	10.1002/crat.200310225

Nd_2-xCe_xCuO_4-y single crystals with different x values have been successfully grown by Traveling Solvent Floating Zone method (TSFZ). Electronic properties of Nd_2-xCe_xCuO_4-y single crystals with various x have been studied in detail. The results show that superconductivity can be found in crystals with x>0.1 (0.13-0.18) directly grown at oxygen-reduced atmosphere without post-annealed, while no superconductivity appears in crystals with x<0.1 at the same atmosphere. It is also found that, the segregation coefficient of Ce is determined to be 0.946 and transition temperature Tc (onset) reaches maximum value of 23.5K at nominal composition x=0.165. With further increase of Ce concentration, transition temperature of single crystals declines due to the precipitation of secondary Phases. In addition, the variation of lattice constants of Nd_2-xCe_xCuO_4-y single crystals with different x is also given.

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