Surface morphology and incommensurate modulation of self-flux grown Bi2Sr2CaCu2O8+x single crystals

resumo

Structural studies have been carried out in large size superconducting single crystals of Bi2Sr2CaCu2O8+x grown by self-flux method. Surface morphology of the crystals in respect of growth steps, slip lines/bands and etch pits has been examined by scanning electron microscopy (SEM). A quantitative study of grain misorientation in the crystals has been conducted by X-ray diffraction, which has also revealed the existence of incommensurate modulation of the crystal structure. A detailed analysis of first and second order satellite reflections associated with the Bragg reflections 0 2 0 and 0 0 3 6, in terms of incommensurate b(*)-components and modulation wave vector q = 0.21b(*) + c(*), has been made. It is proposed that while the second order satellite reflections observed around 0 0 3 6 are linked with the existent neighboring Bragg reflections, the first order satellite reflections are correlated with a forbidden reflection. (C) 2004 Elsevier B.V. All rights reserved.

palavras-chave

HIGH-TC SUPERCONDUCTORS; CU-O SUPERCONDUCTOR; PHYSICAL-PROPERTIES; X-RAY; PHASE; YBA2CU3O7-DELTA; SYMMETRY

categoria

Physics

autores

Kumar, P; Kumar, B; Bdikin, I; Kholkin, AL; Trigunayat, GC

nossos autores

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