Portal de Periódicos da CAPES

Thermal Conductivities of Pure Metals at Low Temperatures: Mercury

1957; American Institute of Physics; Volume: 106; Issue: 5 Linguagem: Inglês

10.1103/physrev.106.927

1536-6065

R. T. Webber, D. A. Spohr,

Superconductivity in MgB2 and Alloys

The thermal conductivity of pure mercury in the normal, superconducting, and intermediate state has been measured at liquid helium temperatures and in magnetic fields up to 1000 gauss. The superconducting-state thermal conductivity conformed to the results previously reported by Hulm. In the normal state, the thermal conductivity was a very strong function of temperature, and, at temperatures below about 3\ifmmode^\circ\else\textdegree\fi{}K, was strongly dependent on the applied magnetic field. In the intermediate state, an additional component of thermal resistance was present at all temperatures measured. At temperatures near ${T}_{c}$, the excess thermal resistance was quite small and in the form of two clearly resolvable maxima. As the temperature was lowered, the magnitude of the excess thermal resistance increased approximately as ($\frac{{T}_{c}}{T}$), in agreement with Hulm, and the resolution of the two maxima was lost. Determinations of the magnitude of the excess thermal resistivity in specimens of 0.10-in. and 0.20-in. diameter showed no dependence on size.