Abstract
Synopsis As a result of previous measurements, proton magnetic resonance in antiferromagnetic copper chloride was expected to occur also in zero external field. Due to the interaction between the two protons in one crystalline water two resonance lines were observed. The proton-proton distance in a crystalline water was calculated from the frequency distance between these two resonance lines. The calculated distance is in good agreement with the results of the measurements of Levy and Peterson using neutron diffraction. It can be concluded that the magnetic moments of the Cu ions cannot be considered as mathematical dipoles located in the centre of the Cu ion (or Cl ion). The magnetization of a sublattice was measured as a function of temperature. The protonspin-lattice relaxation time t1 was measured in zero field as a function of temperature. The temperature dependence of t1 is even more pronounced than in a finite external field. Measurements of t1 as a function of the external field strength were carried out up to the threshold field.
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