Atomic Heats of Normal and Superconducting Tin between 1.2° and 4.5°K

Atomic heat measurements on tin in the normal and superconducting states revealed that the electronic contribution to the atomic heat in the superconducting state, Cₑₛ, could be represented below about 0.7Tc by the same exponential expression found applicable to vanadium: CₑₛγTc=ae^-bTcT, with $a=9.17$ and $b=1.50$. The deduced curve of critical field vs temperature was in good agreement with Hc-T curves reported from magnetic measurements. The critical field extrapolated to the absolute zero, H₀, was 303.4 oersteds and the transition temperature was 3.722^∘{}K. Below 2.5^∘{}K the normal atomic heat could be represented by the Sommerfeld-Debye expression with γ=1.75×10^-3 joule mole^-1 deg^-2 and Θ=195.0^∘K; above 2.5^∘{}K deviation from this expression indicated that Θ decreased with increasing temperature.