Physics – Condensed Matter – Superconductivity
Scientific paper
2002-02-25
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures
Scientific paper
10.1103/PhysRevB.66.134506
The occurrence and development of phase inhomogeneity in {\rm Bi$_2$Sr$_2$CaCu$_2$O$_{8+x}$} single crystals have been investigated by measuring their superconducting transition patterns using a high-sensitivity ac magnetometer. We find that the overdoped {\rm Bi$_2$Sr$_2$CaCu$_2$O$_{8+x}$} single crystals, even if they were single-phased immediately after a high-temperature annealing process, show progressively pronounced multiple superconducting transitions with time as they were kept at room temperature in a dry air atmosphere. The results reveal that the oxygen dopants in the crystal are still mobile at room temperature. These dopants tend to re-arrange and thus form different phases, at a characteristic time scale of one or two weeks or so. Moreover, the diamagnetization loops in the newly segregated phase are very weak, presumably due to the existence of additional inhomogeneity down to a nanometer scale. Our results also show that the optimally doped {\rm Bi$_2$Sr$_2$CaCu$_2$O$_{8+x}$} crystals seem capable to remain in a single phase with time.
Lu Linyuan
Tao H. J.
Wu Sherry X.
Xuan Yi
Zhang Liwei Dennis
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