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

TL;DR

This paper critiques a previous study on cuprate superconductors, arguing that their magnetization results can be explained by Ginzburg Landau theory rather than the vortex scenario, challenging the original interpretation.

Contribution

It provides an alternative explanation for magnetization data in cuprates, emphasizing the role of superconducting fluctuations modeled by Ginzburg Landau theory.

Findings

Magnetization data can be explained by Ginzburg Landau theory.

Challenges the vortex scenario as the primary explanation.

Supports the significance of superconducting fluctuations above Tc.

Abstract

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.