Measurement of the Thermal Boundary Resistance between SolidHe3and Cerium Magnesium Nitrate

Abstract
The thermal boundary resistance between powdered cerium magnesium nitrate and solid He3 was measured in the temperature range between 45 and 250 mK. The phonon bottleneck as well as the phonon-dependent boundary resistance was observed. At low temperatures we observed a magnetic Kapitza resistance in parallel with that due to the phonons. The magnetic Kapitza resistance is proportional to T2 in agreement with theoretical predictions.