ESR study of dibarium copper formate tetrahydrate. Part I

Abstract

ESR investigations on dilute single crystals of dibarium copper formate tetrahydrate, at room temperature and 90°K. have been described. A general method used for the evaluation of theg-tensor in this triclinic crystal, which contains only one ion in the unit cell, has been discussed. A detailed account of the evaluation of the quadrupole interaction is given. Expressions for the positions of the hyperfine levels of the lowest Kramer's doublet of the Cu⁺⁺ ion in the magnetic field have been worked out for the case when B and Q are of similar magnitude.