Esr Linewidths in Neodymium-Doped Calcium Tungstate

Electron spin resonance linewidths of Nd3+ in CaWO4 at 35 GHz and 4.2 K are examined experimentally and theoretically for a range of Nd concentration. The derivative peak-to-peak linewidths, as determined experimentally, increase from 1.1 mT at 0.034% Nd to 4.1 mT at 0.816% Nd in vacancy-compensated single crystals at a polar angle of 90°. The homogeneous broadening is found to be owing almost exclusively to the Nd-Nd dipolar interaction, while the predominant inhomogeneous mechanism is due to a crystalline axis misorientation of 57 min of arc. Both the spin-lattice relaxation time and the linewidth show an anomaly at a polar angle of about 30°, indicating the presence of cross-relaxation to an impurity, probably cerium.

 

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