Mössbauer Effect Investigations of the Magnetic Properties of Single Crystal Thulium Ethylsulphate

Citation

Snively, Frank Thomas (1965) Mössbauer Effect Investigations of the Magnetic Properties of Single Crystal Thulium Ethylsulphate. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/E29S-JS17. https://resolver.caltech.edu/CaltechETD:etd-01272004-104837

Abstract

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. Mossbauer effect experiments have been performed on a single crystal of paramagnetic thulium ethylsulphate with a magnetic field applied. The effect of the electric field of the surrounding ligands in the crystal, as determined from published optical spectroscopic data, combined with the effect of an externally applied magnetic field, has been used to compute the electron wave function of the thulium ion, yielding, within numerical factors, the electric field gradient and magnetic field at the nucleus. The nuclear hyperfine splittings and transition intensities were computed as a function of the ratio of quadrupole interaction energy to the magnetic interaction energy for magnetic fields parallel and perpendicular to the (zz) axis of the electric field gradient tensor. The results of these calculations have been compared with experiment. It has been found that the ratio of internal magnetic field to external magnetic field varies by a factor of at least 35 as the orientation of the crystal is changed. When the field was applied perpendicular to the z-direction, which gave the maximum internal field, the ratio internal to external field was found to be 73 ? 7 at 6.5[degrees]K. Our most significant result is the measurement by a new technique, of the radial integral appearing in the nuclear magnetic hyperfine interaction [...]. The numerical value was found to be [...] = 11.1 ? 1.0 atomic units. Other possible applications of the use of magnetic fields with rare earth single crystals in Mossbauer effect investigations are discussed.

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