Quantitative measurements of the thermal boundary resistance between Cu and solid ${}_{}{}^4{}_{}{}^{}\mathrm{He}$, ${\mathrm{H}}_2$, ${\mathrm{D}}_2$, or Ne have been obtained at temperatures above 1 K. The results suggest that the anomalously small resistance to ${}_{}{}^4{}_{}{}^{}\mathrm{He}$, ${\mathrm{H}}_2$, ${\mathrm{D}}_2$, and perhaps Ne, is to be associated with the importance of quantum effects in these materials.

• Received 4 February 1977

DOI:https://doi.org/10.1103/PhysRevB.15.5466