Diamagnetism above <i>T</i><sub>c</sub> in Underdoped Bi<sub>2.2</sub>Sr<sub>1.8</sub>Ca<sub>2</sub>Cu<sub>3</sub>O<sub>10+δ</sub>

DOI DOI Web Site 参考文献31件 オープンアクセス
  • Tetsuya Iye
    Department of Physics, School of Science and Engineering, Waseda University, Shinjuku, Tokyo 169-8555, Japan
  • Takenori Nagatochi
    Department of Physics, School of Science and Engineering, Waseda University, Shinjuku, Tokyo 169-8555, Japan
  • Ryusuke Ikeda
    Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
  • Azusa Matsuda
    Department of Physics, School of Science and Engineering, Waseda University, Shinjuku, Tokyo 169-8555, Japan

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説明

Single crystals of ${\rm Bi}_{2+x}{\rm Sr}_{2-x}{\rm Ca}_{2}{\rm Cu}_{3}{\rm O}_{10+��}$(Bi2223) with $x=0.2$ were grown by a traveling solvent floating zone method in order to investigate the superconducting properties of highly underdoped Bi2223.Grown crystals were characterized by X-ray diffraction, DC susceptibility and resistivity measurements, confirming Bi2223 to be the main phase.The crystals were annealed under various oxygen partial pressures to adjust their carrier densities from optimally doped to highly underdoped.The fluctuation diamagnetic component above the superconducting transition temperature $T_{\rm c}$ extracted from the anisotropic normal state susceptibilities $��_{ab}(T)$ ($H\perp c$) and $��_{c}(T)$ ($H\parallel c$) was found to increase with underdoping, suggesting a decrease in the superconducting dimensionality and/or increase in the fluctuating vortex liquid region.

6 pages, 7 figures, corrected fig.4 and references, published in J. Phys. Soc. Jpn. 79, 114711 (2010)

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