Susumu Sakaguchi

Specific heat and entropy of dysprosium gallium garnet in magnetic fields

Abstract The specific heat of dysprosium gallium garnet (DyGaG) single crystal has been measured between 20 and 2 K in magnetic fields up to 5 T. From the specific heat and adiabatic demagnetization measurements, the temperature dependence of the entropy in various magnetic fields is determined. It is shown that DyGaG is a good material for magnetic refrigeration between 12 and 2 K.

Silicon single crystal fiber growth by micro pulling down method

Silicon single crystal fibers with a constant diameter as small as 200 µ m have been successfully grown by the micro pulling down technique. Grown crystal fibers are uniform in shape and contain a large defect-free volume. Basic parameters for stable growth were discussed in association with the conservation of mass and heat as well as the meniscus stability of the molten zone.