Microkelvin thermometry with Bose-Einstein condensates of magnons and applications to studies of the AB interface in superfluid ${}^3$He

P. J. Heikkinen, S. Autti, V. B. Eltsov +2

Coherent precession of trapped Bose-Einstein condensates of magnons is a sensitive probe for magnetic relaxation processes in superfluid 3He-B down to the lowest achievable tempera…