Critical-Field Measurement of Superconducting Tungsten as Related to the Cerium-Magnesium-Nitrate Temperature Scale

Measurements of the critical magnetic field curve of tungsten are presented and analyzed to determine the consequences of Abraham and Eckstein's proposed correction to the magnetic temperature scale for powdered cerium magnesium nitrate. The qualitative shape of the tungsten critical-field curve and the derived normal-state electronic specific-heat parameter $\gamma$ favor a considerably smaller temperature correction than that suggested by Abraham and Eckstein.