Abstract
Magnetoacoustic de Haas-van Alphen data on LaAg are compared with a new relativistic band structure calculation including La-4f states. We find convincing agreement of the measured and calculated dHvA frequencies. The deformation of the Fermi surface under strain is determined from the magnetoacoustic dHvA amplitude. The strongest deformation potential coupling is found for three equivalent pockets which become inequivalent under orthorhombic strain. The lifting of their degeneracy leads to the softening of theT 3 elastic constant. This is different from the useual band Jahn-Teller effect which is based on the lifting of subband degeneracy at a single point ink-space.
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Dedicated to Professor Harry Thomas on the occasion of his 60th birthday
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Niksch, M., Lüthi, B. & Kübler, J. Electron-phonon interaction in LaAg. Z. Physik B - Condensed Matter 68, 291–298 (1987). https://doi.org/10.1007/BF01304242
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DOI: https://doi.org/10.1007/BF01304242