Abstract
Nuclear magnetic resonance absorption of protons in a single-crystal of CuCl2.2H2O has been studied. At temperatures of liquid hydrogen the resonance diagrams are similar to those in single-crystals of the paramagnetic salt CuSO4.5H2O. In the liquid helium region, however, the resonance diagrams are always symmetrical about the proton line in water. This symmetry and also the temperature dependence of the resonance lines indicate that CuCl2.2H2O is anti-ferromagnetic below about T = 4.3°K. A threshold value of the magnetic field as predicted by Née1 has been found. Measurements have been carried out both in a field below and in a field above this threshold value. From the measurements in weak fields the position of the protons in the crystal can be calculated.
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