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- W1990383934 abstract "The bulk upper critical field ${H}_{c2}$ of single crystals of Nb and V has been measured for various crystallographic orientations within the temperature range between the respective critical temperature and $Tensuremath{approx}0.06$ ifmmode^circelsetextdegreefi{}K. The normalized critical field averaged over all crystallographic directions $〈h(t)〉=frac{〈{H}_{c2}(t)〉}{{(ensuremath{-}frac{d{H}_{c2}}{mathrm{dt}})}_{t=1}}$, where $t=frac{T}{{T}_{c}}$, and the relative anisotropy of ${H}_{c2}$ for the two metals are found to be similar. The measurements support predictions of the Hohenberg-Werthamer calculation that attributes the observed anisotropy of ${H}_{c2}$ to the effects of an anisotropic Fermi surface. Some differences in the behavior of ${H}_{c2}(t)$ for the present samples can be understood qualitatively to arise from the effects of a shorter electron-collision time $ensuremath{tau}$ for the less pure V specimen. At very low temperatures, ${H}_{c2}(0)ensuremath{-}{H}_{c2}(t)$ for V does not follow a ${t}^{2}mathrm{ln}(t)$ temperature dependence, previously observed for Nb, but can be characterized by an empirical formula ${t}^{2}mathrm{ln}(t+ensuremath{alpha})$ in which the constant $ensuremath{alpha}$ is conjectured to be inversely proportional to $ensuremath{tau}$." @default.
- W1990383934 created "2016-06-24" @default.
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- W1990383934 date "1970-11-01" @default.
- W1990383934 modified "2023-10-17" @default.
- W1990383934 title "Bulk Upper Critical Field of Clean Type-II Superconductors: V and Nb" @default.
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- W1990383934 doi "https://doi.org/10.1103/physrevb.2.3545" @default.
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