Abstract
We present here a double stage adiabatic demagnetization apparatus for specific heat measurements down to 0·015°K. Great care has been taken to avoid heat leaks which have been reduced to less than 1 erg/min. To cool salts, sample, and shields from 80°K to 1·3°K, a heat exchanger using the circulation of He has been built. The principal thermometer is a 1 g sphere of cerium magnesium nitrate (CMN), the susceptibility of which is measured with a Cryotronics mutual inductance bridge. A primary current divider has been added to decrease the stray heating of the specimen holder by the primary field below 1°K and to increase the sensitivity during the calibration. The thermal equilibrium between the sample and the thermometer has been studied. A specific heat as low as 70 μJ at 70 mdeg has been measured. The precision is discussed.
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