Comment on ''Field-Enhanced Diamagnetism in the Pseudogap State of the Cuprate Bi2Sr2CaCu2O8+δSuperconductor in an Intense Magnetic Field''

Details Comment on ''Field-Enhanced Diamagnetism in the Pseudogap State of the Cuprate Bi2Sr2CaCu2O8+δSuperconductor in an Intense Magnetic Field'' Comment on ''Field-Enhanced Diamagnetism in the Pseudogap State of the Cuprate Bi2Sr2CaCu2O8+δSuperconductor in an Intense Magnetic Field''

2006-06-05

arxiv.org/abs/cond-mat/0606119v3

Phys. Rev. Lett. 98, 119701 (2007)

Physics

Condensed Matter

Superconductivity

Final version

Scientific paper

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.

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