Upper critical field and anisotropy of the high-TcBi2Sr2Ca2Cu3Oxphase

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Abstract

The upper critical field (${\mathit{H}}_{\mathit{c}2}$) of the 110-K ${\mathrm{Bi}}_{2}$${\mathrm{Sr}}_{2}$${\mathrm{Ca}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{\mathit{x}}$ phase has been obtained using high-quality whiskers and the measurement of the field-induced resistive transition up to 7.5 T. In the presence of magnetic fields parallel and perpendicular to the c axis, linear relations are obtained in ${\mathit{H}}_{\mathit{c}2}$-T curves defined at the 50% value of the extrapolated normal-state resistivity in the transition curves. According to the Werthamer-Helfand-Hohenberg theory and Ginzburg-Landau relations, the coherence lengths of ${\ensuremath{\xi}}_{\mathit{a}\mathit{b}}$(0)=29 \AA{} and ${\ensuremath{\xi}}_{\mathit{c}}$(0)=0.93 \AA{} are obtained. The anisotropy ratio of the coherence length is 31.

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