Electron paramagnetic resonance of Er3+ doped in YVO4: hyperfine parameters Original Research Article

X-band (∼9.60 GHz) electron paramagnetic resonance (EPR) spectra of the Er3+ Kramers ion substituting for the Y3+ ion in yttrium vanadate (YVO4) single crystal were recorded at liquid-helium temperatures. Fine and hyperfine EPR transitions were observed for the 166Er (zero nuclear magnetic moment) and 167Er (I=7/2) isotopes, respectively. The values of the elements of the anisotropic g̃2- and Ã2-tensors of the 167Er3+ ion, and those of the g̃2 tensor for the 166Er ion, were estimated. The admixture of crystal-field wave functions in the ground-state wave function of Er3+ were determined using the experimental g-values.