ULTRASONIC PARAMAGNETIC RESONANCE OF TETRAVALENT URANIUM IN CALCIUM FLUORIDE,
Abstract
The pulse-echo technique of ultrasonic paramagnetic resonance (UPR) was used at frequencies of 0.47-8.9 gigahertz and liquid helium temperatures to study the spin-lattice interaction between the U(4+) paramagnetic ion and a CaF2 lattice. A spin Hamiltonian is given which considers the effect of random strains on the UPR line shape. A spin-lattice Hamiltonian quadratic in spin and linear in strain was found applicable to the results. The G(ijkl) is the spin-lattice coupling tensor and epsilon kl is the strain due to an ultrasonic vibration. The frequency dependence of the UPR attenuation was studied in the range 1.1 to 8.9 gigahertz. The results agreed with the predicted dependence on frequency squared. The temperature dependence of the UPR attenuation was studied in the range 1.0 to 10.0K. Good agreement was found between the results and the theoretical dependence on 1/T. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 26, 1968
- Accession Number
- AD0679042
Entities
People
- Perry Frank Mcdonald
Organizations
- United States Army Aviation and Missile Command