The Superconducting and Normal Heat Capacities of Niobium

摘要: Data on the heat capacity of niobium in normal and superconducting phases are presented temperature interval 2.5\ifmmode^\circ\else\textdegree\fi{}K to 11\ifmmode^\circ\else\textdegree\fi{}K. The ${c}_{n}$ was found be given by usual relation: ${c}_{n}=\ensuremath{\gamma}T+\frac{464{T}^{3}}{{\ensuremath{\Theta}}^{3}}$, where $\ensuremath{\gamma}=20.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ cal/M ${\mathrm{deg}}^{2}$ $\ensuremath{\Theta}=252\ifmmode^\circ\else\textdegree\fi{}$K. zero-field transition ${T}_{0}$ 8.70\ifmmode^\circ\else\textdegree\fi{}K\ifmmode\pm\else\textpm\fi{}0.10\ifmmode^\circ\else\textdegree\fi{}, discontinuity $\ensuremath{\Delta}c$ at this 0.0368 deg. phase depart from a ${T}^{3}$ dependence below 5\ifmmode^\circ\else\textdegree\fi{}K. entire curve could not represented either Koppe relation or $\ensuremath{\alpha}$ model. ${H}_{T}$ vs $T$ deduced data very nearly parabolic, with value ${H}_{0}=2000$ gauss $\frac{d{H}_{T}}{\mathrm{dT}}$ equal 453 gauss/deg.