Abstract
We have studied the EPR of a single crystal of the Tutton salt Cu(NH 4) 2(SO 4) 2.6H 2O in rotations around the a and c ∗ axes, and around the magnetic β(≡ b) and γ axes at X-band and room temperature. When the magnetic field lies in the ( a, c) plane, the two Cu 2+ ions are magnetically equivalent and the EPR spectrum reduces to a quasi-Lorentzian single line. Due to the two dissimilar copper ions, the EPR spectrum is a more or less resolved doublet, according to the orientation of the magnetic field. When the magnetic field is parallel to one tetragonal axis, the EPR spectrum is a perfectly resolved doublet, characteristic of a very weak exchange interaction J′ between the dissimilar ions. The simulation of the EPR spectrum for the compound under study reveals that the exchange coupling between dissimilar ions is practically equal to zero at room temperature at the accuracy of 0.0002 cm −1.
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