Fluctuations in $YB{a}_{2}C{u}_3{O}_{6.5}$ single crystal: an evidence for 2D->3D crossover

B. Rosenstein, B. Ya. Shapiro, R. Prozorov +2

Magnetization measurements as a function of temperature are reported for $YB{a}_{2}C{u}_3{O}_{6.5}$ crystal (T_{c}=45.2 K) for fields between 0.2 to $3.5Tesla$. All isochamps for H>1…