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|Title:||Magnetization studies of mercury-cuprates and its precursors|
|Citation:||JOURNAL OF SUPERCONDUCTIVITY, 18(4), 475-480|
|Abstract:||The mercury-cuprates such as (Hg, Cr)/Sr-1201 and (Hg, Re)/Sr-1201 were synthesized by encapsulation-technique at 880-920 degrees C for 12-16h, and characterized by power XRD, M(T) and M(H). All the precursors (Sr2CuO3, Cr0.30Sr2CuOy or Re0.10Sr2CuOy) were found to be non-superconducting. The samples with optimal composition (HgO.7OCro.30)Sr2CuO4+delta [(Hg, Cr)/Sr-1201] and (Hg0.90Re0.10)Sr2CuO4+delta [(Hg, Re)/Sr-1201] are superconducting with T-c(onset) similar to 58 and similar to 54 K, respectively. At low temperatures (below 10 K), on cooling in D.C.-magnetic field of 4 kOe, the sample (Hg, Re)/Sr-1201 shows a dramatic decrease in diamagnetic signal. Further, this effect is also faintly reflected in the M(H) curve. Such a behaviour was not observed in the (Hg, Cr)/Sr-1201 cuprates. We ascribe this effect to a field enhanced paramagnetic contribution possibly arising from mixed valent (6+, 7+ dominant) Re ions in the (Hg, Re)/Sr-1201 cuprates.|
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