Physics – Condensed Matter – Superconductivity
Scientific paper
2010-02-16
Physics
Condensed Matter
Superconductivity
2 pages, 2 figures. Final version accepted for the Proceedings of the M2S-IX Conference (Tokyo, September 2009)
Scientific paper
10.1016/j.physc.2010.01.027
The characteristic pseudogap temperature T* in Bi2Sr2CaCu2O8 system has been systematically evaluated as a function of doping, especially focusing on its overdoped region, by measuring the out-of-plane resistivity under the magnetic fields. Overdoped samples have been prepared by annealing TSFZ-grown Bi2Sr2CaCu2O8 single crystals under the high oxygen pressures (990 kgf/cm2). At a zero field, the out-of-plane resistivity showed a metallic behavior down to Tc (= 62 K), while under the magnetic fields of over 3 T,it showed typical upturn behavior from around 65 K upon decreasing temperature. This result suggests that the pseudogap and superconductivity are different phenomena.
Kobayashi Norio
Koike Yoji
Kudo Kazutaka
Kushibiki Haruki
Murata Kousuke
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