Crystal growth and characterization of superconducting lead cuprates
1991; Elsevier BV; Volume: 113; Issue: 3-4 Linguagem: Inglês
10.1016/0022-0248(91)90069-h
ISSN1873-5002
AutoresJ. S. Xue, M. Reedyk, A. Da̧bkowski, H. A. Dabkowska, John E. Greedan, C.H. Chen,
Tópico(s)Advanced Condensed Matter Physics
ResumoAbstract High quality single crystals of Pb 2 Sr 2 (R/Ca)Cu 3 O 8 + y ( R = Nd , Sm , Gd , Dy , Er , Tm , Yb , Lu and Y ), the 2213 phase of the lead cuprate family, have been grown by PbO/NaCl flux and seed crystal methods. The role of NaCl and the pseudobinary phase diagrams of the crystal growth system are investigated. A correlation between crystal quality and superconducting properties of Pb 2 Sr 2 (R/Ca)Cu 3 O 8 + y is observed. The 1212 lead cuprate phase has also been prepared in single crystal form by a semi-ceramic method. The oxygen partial pressure seems to be the key to the determination of the product compound in the crystal growth process; the 2213 lead cuprate phase can be prepared under low oxygen partial pressure while the 1212 phase requires an oxidizing atmosphere.
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