Volume 81, Number 2, January 2008
Article Number 27005
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
Published online 14 December 2007
EPL, 81 (2008) 27005
DOI: 10.1209/0295-5075/81/27005

Relationship between superfluid density at zero temperature and Tc of Bi2Sr2-xLaxCuO6+$_\delta$ (0.4 $\le$ x $\le$ 0.76) and Bi2Sr1.6La0.4Cu1-yZnyO6+$_\delta$ (0.0 $\le$ y $\le$ 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, $\rho _{s}(0)$, and superconducting transition temperature, Tc, for the underdoped Bi2Sr2-xLaxCuO6+$_\delta$ and nearly optimally doped Bi2Sr1.6La0.4Cu1-yZnyO6+$_\delta$, using isothermal reversible magnetization. In our study, we found that $\rho _{s}(0)$ in Bi2Sr2-xLaxCuO6+$_\delta$ and Bi2Sr1.6La0.4Cu1-yZnyO6+$_\delta$ 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.

© EPLA 2008