Structural changes in ab-plane of Zn doped Bi-2212HTSC single crystals

resumo

Single crystals of undoped and 1% Zn-doped Bi-2212 are grown by self-flux slow cooling method tinder similar growth conditions. T,(AT,) are found to be 84 K (2 K) and 82 K (8 K) for undoped and doped samples respectively. Effect of Zn doping on structure and modulation is studied. Different change in the value of a- and b-axes are observed resulting in a transformation of structure from tetragonal to orthorhombic one. However, no effective change in modulation is there. Distortions are compared in c- and b-axes for undoped and doped samples. The asymmetry in position and intensity of satellite peaks has been discussed. The value of a in excess of b has been reported for the first time. These results are discussed in terms of valancy, coordinates and position of occupancy of Zn ions vis-A-vis those of Cu- ions in Cu-O plane of the structure. (c) 2006 Published by Elsevier B.V.

palavras-chave

X-RAY-DIFFRACTION; ELECTRON-DIFFRACTION; MODULATED STRUCTURE; IMPURITY ATOMS; GROWTH; SUPERCONDUCTIVITY; BI2SR2CACU2O8+DELTA

categoria

Physics

autores

Lovleena; Bidikin, IK; Kholkin, AL; Kumar, B

nossos autores

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