EPR STUDY OF THE DYNAMIC JAHN-TELLER EFFECT OF CU2-CRYSTALS( IN CD(HCOO)(2)2H(2)O SINGLE)

The X-band EPR spectra of Cu2+ doped into cadmium formate dihydrate si ngle crystal was studied at 113 degrees K. The powder spectrum of the same material was studied over the temperature range from 113 to 300 d egrees K The observed values of the g and A hyperfine coupling constan ts and linewidths were found to be temperature dependent. The temperat ure dependence of Cu2+ EPR spectrum values were discussed in terms of dynamic Jahn-Teller effect. The tensor elements of g and A were calcul ated fi om the polycrystalline samples at various temperature and it i s found that the spectrum at 113 degrees K has given followings, g(xx) = 2.108 +/- 0.002, g(yy) = 2.085 +/- 0.002, g(zz) = 2.431 +/- 0.002 a nd A(xx) = 48 +/- 1, A(yy) = 17 +/- 1, A(zz) = 11 +/- 1 Gauss.