Relationship between superfluid density at zero temperature and Tc of Bi2Sr2-xLaxCuO6+ (0.4 x 0.76) and Bi2Sr1.6La0.4Cu1-yZnyO6+ (0.0 y 0.015)G. C. Kim1, M. Cheon2, S. S. Ahn1, J. H. Jeong3 and Y. C. Kim1
1 Department of Physics, Pusan National University - Busan 609-735, Korea
2 Department of Physics, West Verginia University - Morgantown, WV 26506-6315, USA
3 Department of Physics, Pukyung National University - Busan 608-737, Korea
received 29 August 2007; accepted in final form 19 November 2007; published January 2008
published online 14 December 2007
We have studied the relationship between superfluid density at zero temperature, , and superconducting transition temperature, Tc, for the underdoped Bi2Sr2-xLaxCuO6+ and nearly optimally doped Bi2Sr1.6La0.4Cu1-yZnyO6+, using isothermal reversible magnetization. In our study, we found that in Bi2Sr2-xLaxCuO6+ and Bi2Sr1.6La0.4Cu1-yZnyO6+ is proportional to Tc2, which is nearly in agreement with the relation suggested from the quantum criticality.
74.25.Ha - Magnetic properties.
74.72.Hs - Bi-based cuprates.
74.25.Dw - Superconductivity phase diagrams.
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