Abstract
Paramagnetic crystals and two diamagnetic crystals containing 54Mn were indirectly cooled in the presence of a magnetic field to temperatures T in the region of 0.03 to 0.2°K. To cool effectively the nuclear spins of 54Mn the presence is required of numerous paramagnetic ions with an energy splitting which is not larger than about 9 ▪ T i.e. the nuclear spin-lattice relaxation time becomes quite long when the electron spins are strongly ordered in a magnetic field. This was demonstrated for the following substances: CoCs 2( SO 4) 2.6 D 2 O; ( Ce x La 1- x ) 2 Mg 3( NO 3) 12.24 H 2 O for x = 1 and 0.1; Ni( NH 4) 2( SO 4) 2.6 H 2 O and ZnCs 2( SO 4) 2.6 H 2 O. Further a lowering of the temperature by applying a large magnetic field was observed in the Ni salt. This is caused by the crossing of the Ni energy levels through cancelling of crystalline field energy and Zeeman energy.
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