EPR studies of Cu(II) doped glycine lithium sulphate single crystals – a case of low hyperfine coupling constant

In order to rationalize the low hyperfine value for the parallel component of copper nucleus, another system with lithium as host has been investigated using Electron Paramagnetic Resonance (EPR) technique. Single crystal EPR studies have been carried out at 300 K on Cu(II) doped glycine lithium sulphate system. Angular variation of hyperfine structure lines in the three orthogonal planes show the presence of two sites which are magnetically inequivalent but chemically equivalent with g and A values as: g_xx = 2.084, g_yy = 2.057, g_zz = 2.311 and A_xx = 8.96 mT, A_yy = 3.26 mT, A_zz = 15.95 mT respectively. The impurity entered the lattice interstitially. The admixture and molecular coefficients are evaluated by collaborating EPR data with optical data. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)