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

The in-plane magnetoresistance of an epitaxial Bi $_{2}$ Sr $_{2}$ CuO $_{6 + δ}$ thin film was systematically investigated as a function of doping, above $T_{c}$ . The orbital magnetoconductance is used to extract the crossover field line $H_{c 2}^{*} (T)$ 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.

Upper critical field from normal state fluctuations in Bi $_{2}$ Sr $_{2}$ CuO $_{6 + δ}$

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Upper critical field from normal state fluctuations in Bi $_{2}$ Sr $_{2}$ CuO $_{6 + δ}$

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Upper critical field from normal state fluctuations in Bi22​Sr22​CuO6+δ6+δ​

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Upper critical field from normal state fluctuations in Bi22​Sr22​CuO6+δ6+δ​

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Upper critical field from normal state fluctuations in Bi $_{2}$ Sr $_{2}$ CuO $_{6 + δ}$

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Upper critical field from normal state fluctuations in Bi $_{2}$ Sr $_{2}$ CuO $_{6 + δ}$

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