%0 Journal Article
%T Diamagnetism of YBa$_{2}$Cu$_{3}$O$_{6+x}$ crystals above $T_c$~: evidence for Gaussian fluctuations
%A I. Kokanovi£¿
%A D. J. Hills
%A M. L. Sutherland
%A R. Liang
%A J. R. Cooper
%J Physics
%D 2013
%I arXiv
%R 10.1103/PhysRevB.88.060505
%X The magnetization of three high-quality single crystals of YBa$_{2}$Cu$_{3}$O$_{6+x}$, from slightly overdoped to heavily underdoped,has been measured using torque magnetometry. Striking effects in the angular dependence of the torque for the two underdoped crystals, a few degrees above the superconducting transition temperature ($T_c$) are described well by the theory of Gaussian superconducting fluctuations using a single adjustable parameter. The data at higher temperatures ($T$) are consistent with a strong cut-off in the fluctuations for $T\gtrsim1.1T_c$. Numerical estimates suggest that inelastic scattering could be responsible for this cut-off.
%U http://arxiv.org/abs/1303.6860v2