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

✍ Scribed by Lovleena; I.K. Bidikin; A.L. Kholkin; Binay Kumar

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 185 KB
• Volume: 451
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2006.10.003

✦ Synopsis

Single crystals of undoped and 1% Zn-doped Bi-2212 are grown by self-flux slow cooling method under similar growth conditions. T c (DT c ) 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 À ions in Cu-O plane of the structure.