Magnetic Resonance Lineshapes of Pr3+ in Double Nitrate Crystals

Abstract

The lineshapes for 10 concentrations of Pr3+ in double nitrate crystals have been measured. The data have been interpreted in terms of a distribution of zero-field splittings and a symmetrical broading. The effect of electric-field-induced transitions on the interpretation of the shapes is concisely described and the values of the electric field interaction constant are reported for La(C2H5SO4)3·9H2O, Y(C2H5SO4)3·9H2O, LaCl3, La2Mg3(NO3)12·24H2O, and La2Zn3(NO3)12·24H2O. From the concentration dependence of the Pr resonance lineshape, it is concluded that the major source of zero-field splitting is due to the misfitting of Pr and La ions in the lattice. In Pr2Mg3(NO3)12·24H2O, there is almost no asymmetrical broadening due to a distribution of Δ, but there is a large symmetrical broadening of about 0.095 cm−1. The origin of this symmetrical broadening appears to be an effective spin-spin interaction anomalously large for rare earth ions in the double nitrates.

Low temperature cooperative behavior of the rare earth salts GdCl₃ and PrCl

“…Ion Properties 3+ The absorption spectrum of the Pr ion shows the 3 ground level to be H. (Judd, 1957 Their results are g = 1.035 ± 0.005, g = 0.1 ± 0.15, A = (5.02 ± 0.03) x 10~2 cm 1 , and A = 0.02 cm 1 . Later Culvahouse, Pfortmiller, and Schinke (1968) have shown that the microwave electric field is responsible for the magnetic 3+ field dependent absorption of Pr ions. They replace the A term with a term of the form Y(E X S X + E y S y ) where 4 1 1 Y = 6.0 x 10 (cm /statvolt.…”