Comment on ''Field-Enhanced Diamagnetism in the Pseudogap State of the   Cuprate Bi2Sr2CaCu2O8+\delta Superconductor in an Intense Magnetic Field''
  In the above mentioned letter by Wang et al. [Phys. Rev. Lett, 95, 247002 (2005)], magnetization measurements on two Bi_2Sr_2caCu_2O_8+delta samples are reported. They claim that these experimental results support the vortex scenario for the loss of phase coherence at Tc. On the contrary, we show in this comment that they can be explained by means of the Ginzburg Landau theory (under a total-enery cutoff) for the superconducting fluctuations above Tc. 
L. Cabo, J. Mosqueira, and F. Vidal