MILLIMETER ELECTRON PARAMAGNETIC RESONANCE IN STRONTIUM TITANATE.
SYRACUSE UNIV N Y DEPT OF PHYSICS
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The axial electron spin resonance spectrum of Fe3 doped SrTiO3 was investigated at room temperature at frequencies of 35.01, 65.09, 69.4 and 75 GHz. The magnetic field was variable from 0 to 25 K-gauss. A value of 2D81.2 plus or minus .14 GHz was found for the zero field splitting. An upper limit on the higher order zero field splitting terms a and F was found to be 0.5 GHz. The Hamiltonian was diagonalized using the above value of 2D on a computer, and the energy levels thus obtained were found to agree well with the experiment. The maximum transition probabilities were also calculated. The ratio of the intensities of the central cubic line and the axial -12 to 12 line was measured at an angle of 0 degrees. The results are in general agreement with the hypothesis that the axial spectrum is caused by local charge compensation. The crystal was subjected to a heat treatment by the National Lead Company. This heating is thought to either change Fe2 to Fe3 or Fe2 to Fe4 in the SrTiO3. Intensity measurements seem to indicate that the latter probably is more correct. Author
- Fluid Mechanics
- Atomic and Molecular Physics and Spectroscopy
- Solid State Physics