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vs. T data such as those shown in Fig. 15.7. For a given H, the temperature for which (p/po) 0 is used to obtain Hc2(T). Results of this data analysis for K3C60 are shown in Fig. 15.8.

Assuming the validity of BCS theory, one can obtain the zero-temperature value of the critical field Hc2(0) from the slope of the Hc2(T) data near Tc by means of the Werthamer, Helfand, and Hohenberg (WHH) formula [15.71]:

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