Upper critical field from normal state fluctuations in Bi$_2$Sr$_2$CuO$_{6+δ}$

Details Upper critical field from normal state fluctuations in Bi$_2$Sr$_2$CuO$_{6+δ}$ Upper critical field from normal state fluctuations in Bi$_2$Sr$_2$CuO$_{6+δ}$

2005-12-05

arxiv.org/abs/cond-mat/0512093v3

Phys. Rev. B 74, 064513 (2006)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.74.064513

The in-plane magnetoresistance of an epitaxial Bi$_2$Sr$_2$CuO$_{6+\delta}$ thin film was systematically investigated as a function of doping, above $T_c$. The orbital magnetoconductance is used to extract the crossover field line $H_{c2}^*(T)$ in the fluctuation regime. This field is found in good agreement with the upper critical field obtained from resistivity data below $T_c$, and exhibits a similar upward curvature, thus pointing toward the existence of a critical correlation length. The consequences regarding the nature of the resistive transition are discussed.

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