Dipolar Line Broadening in Gadolinium-Doped Calcium Tungstate

Electron spin resonance linewidths of Gd7/2 in single crystal calcium tungstate (CaWO4) were examined experimentally and theoretically for Gd concentrations up to 0.05%, at the range over which single site occupation by gadolinium was maintained. The linewidths expressed as widths between points of maximum slope on derivative spectra, lay between 0.3 and 1.5 mT over the angular ranges 0° < θ < 90° and 0 < φ < 90° explored. There is good agreement between the form of the angular variation of linewidth and calculation based on dipolar broadening theory. Quantitatively, however, the predicted values are about five time larger than the observed linewidths; this difference may be due to exchange narrowing.

 

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