YbGG material for Adiabatic Demagnetization in the 100 mK–3 K range

Adiabatic Demagnetization Refrigerators (ADR) are particularly well adapted for the lowest temperature cooling requirements of the recent and planned astrophysics missions, such as Hitomi, Athena, SPICA or LiteBIRD. With the dilution refrigerator, they are the only established technologies for space to reach temperatures below 200 mK. In the present work, we focus on the heart of the ADR, the paramagnetic material. While the efficiency of the...