Electron resonance and relaxation at 300 MHz of trivalent praseodymium in lanthanum magnesium double nitrate

Abstract

The novel forms of magnetic and electric field induced resonances observed in the electronic spectrum of Pr3+ in LMN at 300 MHz are interpreted in terms of the same statistical model of random strains as is employed at microwave frequencies. The spin lattice relaxation for 1.3<T<3.2K at this frequency is measured and compared both with theoretical estimates and with the high frequency measurements. It is probable that the real direct process is seen, free of bottleneck, as well as the T7 Raman relaxation. Both are studied across the inhomogeneous line width, since strains are of the same order as the radio frequency quantum and the nature of the eigenstates of the doublet in resonance changes completely on scanning the resonance line. The T5 Raman process suggested earlier to be important under these conditions has not been observed.