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Growth and characterization of superconductive Nd 2‐x Ce x CuO 4‐y single crystals
Author(s) -
Jia L. S.,
Chen X. L.,
Yang W.,
Yan X. L.
Publication year - 2004
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200310225
Subject(s) - superconductivity , analytical chemistry (journal) , superconducting transition temperature , crystallography , lattice constant , transition temperature , single crystal , materials science , chemistry , condensed matter physics , physics , diffraction , optics , chromatography
Nd 2‐x Ce x CuO 4‐y single crystals with different x values have been successfully grown by Traveling Solvent Floating Zone method (TSFZ). Electronic properties of Nd 2‐x Ce x CuO 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 23.5 K 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‐x Ce x CuO 4‐y single crystals with different x is also given. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)