ESR studies were performed on a single crystal of ferroelectric LiNbO3 doped with manganese. Mn2+ in an axially symmetric site is described by the spin Hamiltonian [H=gβ H·S+B20D20+B40040+B43043+(B43043)*+AS·I]. Values for B43(B43=0, B43I=17 G) reported here, have not been reported previously. By examining the temperature dependence of B43 and B40 a value for the fractional change in the optical parameter Dq[(1/Dq)(∂Dq/∂T)=−3.5 × 10−3 °C−1] has been calculated. A discussion of the temperature dependence of B20 is also given.
ESR studies were performed on a single crystal of ferroelectric LiNbOa doped with chromium. For the main spectrum, attributed to Cr3+ at the Nb site, all transitions (including forbidden transitions) were identified. The experimental rotation pattern observed at X-band frequency was compared with that computed from the appropriate spin Hamiltonian {X=H.y.s+D[Sl-lS(S+lJI and the best fit ESR parameters obtained: D=0.411 cm-1 and g= 1.969. In examining these parameters as a function of temperature, the g value was found to be temperature independent, and the variation of D with temperature was attributed to anisotropic lattice expansion. On the main central transition, two additional peaks were observed. EPR parameters (D=0.21±0.02 cm-1 and g= 1.97) are given for the peak on the high-field side. It is proposed that this peak arises from Cr3+ at the Li site. A discussion of the peak on the low-field side is also given.
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