Dynamic susceptibility curves observed as a function of frequency often deviate considerably from curves predicted by the simple Casimir-Du Pr6 model. In the case of cerium magnesium nitrate these deviations are mainly caused by the poor thermal conductivity of the liquid or gaseous helium that surrounds the sample and becomes extremely large when the external magnetic field becomes larger than...

Liquid 4He shows a dewetting phase on Cs and Rb at low temperatures. These are the only substrates which are not wetted by 4He. On Cs the wetting temperature, Tw, is about 2 K. Usually one observes a thick metastable helium film remaining on the Cs substrate when either the surface is cooled below Tw (so starting from a wet film) or when bulk helium (in the form of a drop or an advancing film) ...

Materials with superior cryogenic strength and good ductility are increasingly in demand for resident friendly liquid-hydrogen (20K) storage tanks. Additionally, the space industry also requires materials that retain excellent mechanical properties at extremely low temperatures. However, testing such temperatures is highly limited due to difficulties achieving maintaining conditions, while prov...