Diamagnetism above Tc in underdoped Bi2.2Sr1.8Ca2Cu3O10+d

Abstract

Single crystals of ${\mathrm{Bi}}_{2+x}{\mathrm{Sr}}_{2-x}{\mathrm{Ca}}_2{\mathrm{Cu}}_3{\mathrm{O}}_{10+\delta }$(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 $T_{\mathrm{c}}$ extracted from the anisotropic normal state susceptibilities ${\chi }_{ab}(T)$ ($H\perp c$) and ${\chi }_c(T)$ ($H\parallel c$) was found to increase with underdoping, suggesting a decrease in the superconducting dimensionality and/or increase in the fluctuating vortex liquid region.

arXiv comment6 pages, 7 figures, corrected fig.4 and references, published in J. Phys. Soc. Jpn. 79, 114711 (2010)

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Cited by in corpus (2)

• Flow equation approach to the linear response theory of superconductors
• Effects of vortex and antivortex excitations in underdoped Bi${}_2$Sr${}_2$Ca${}_2$Cu${}_3$O${}_{10+\delta }$ bulk single crystals