Abstract
The magnetization of three small high-quality single crystals:
YBa$_2$Cu$_3$O$_7$, YBa$_2$Cu$_3$O$_6.5$ and
YBa$_2$Cu$_3$O$_6.36$ has been measured using torque magnetometry. Most
of the data are consistent with the theory of Gaussian superconducting
fluctuations, together with a strong cut-off above $T1.1T_c$. The
effect of inelastic scattering could be an important ingredient for achieving
detailed understanding.
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