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The Werthamer-Helfand-Hohenberg (WHH) formula $$μ_0H_{c2}(0)=0.693μ_0T_c\frac{dH_{c2}}{dT}|T→Tc$$ was used to estimate μ$_0$H$_c$2(0) at 0 K where only orbital breaking effects are considered in the dirty limit. In various research articles this equation has been fitted with experimental $H_{c2}$ vs T. How can this equation be fitted? My understanding is $$\frac{dH_{c2}}{dT}|T→Tc$$ is a number, so instead of getting many numbers [which is required to fit this equation] i will get only one number. Kindly help me in this.

For reference https://journals.aps.org/prmaterials/abstract/10.1103/PhysRevMaterials.3.024802

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