Physics – Condensed Matter – Superconductivity
Scientific paper
2006-01-12
Phys. Rev. B vol.73, 092504 (2006).
Physics
Condensed Matter
Superconductivity
4pages, 4 figures
Scientific paper
10.1103/PhysRevB.73.092504
We report a systematic study of the dynamic microwave conductivity near $T_c$ for La$_{2-x}$Sr$_x$CuO$_4$ (LSCO) thin films with $x$=0.07 to 0.16. The strong frequency dependence of the phase stiffness together with scaling analysis of the ac fluctuating conductivity of superconductivity provide direct evidence for the 2D-XY behavior of nearly decoupled CuO$_2$ planes in underdoped LSCO ($x$=0.07 and 0.12). On the other hand, the critical exponents for slightly overdoped LSCO ($x$=0.16) were found to agree with those for the relaxational 3D-XY model, indicating that the universality class in LSCO is changed by hole doping. The implication of these results for the phase diagram of high-$T_c$ cuprates is discussed.
Kitano Haruhisa
Maeda Atsutaka
Ohashi Takeyoshi
Tsukada Ichiro
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