Final demagnetization temperature

Iron ammonium alum, Fe2(S04)3 (NH4)2S04 24H20, has a Curie constant of 4.35 cm3 deg/mol and a molecular weight of 482. The specific heat constant Aj/R is 0.0142 deg2. Its density is 1.71 g/cm3. The material is placed in a magnetic field of 10,000 G, cooled to 1.5 K, and subsequently demagnetized adiabatically. What is the final temperature attained with this material ... 

To confirm the demagnetization field hypothesis, we repeated the same experiments with presaturation pulses both on and off resonance for both samples (off-resonance pulses had no effect), and then proceeded to repeat all tests on a 500 MHz spectrometer equipped with a room temperature probe. Finally we moved to a different 500 MHz spectrometer located in a different building equipped with a 5 mm cold probe and repeated the experiments (data not shovm). The tests on the 500 MHz spectrometers confirmed that the lock perturbations were proportional to the spectrometer magnetic field strength, the presence of a high Q cooled-probe, and the concentration of H in the sample. Future examinations will... 

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