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Fermi surface changes and electron scattering anisotropy in the potassium-rubidium alloy system

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Abstract

The de Haas-van Alphen effect has been used to study the changes in Fermi surface (FS) dimensions and the electron scattering in dilute K(Rb) and Rb(K) alloys. Small discrepancies, around 10%, have been found between the observed FS cross-section changes and those calculated from a linear interpolation of the lattice constant between the two host values, the cross-section changing more rapidly than expected in each case: these discrepancies appear to reflect rather accurately a real nonlinearity in the lattice constant change with solute concentration. There are also measurable changes in the FS anisotropy, which are described well by a combination ofs andp phase shifts in K(Rb) and bys andd in Rb(K). The electron scattering has a significant forward-scattering component, the ratiox ρ/x 0 between the resistivity temperature and the average Dingle temperature being 0.63 and 0.59 for K(Rb) and Rb(K), respectively. The scattering rate anisotropy in Rb(K) is about 7%, with the maximum rate at 〈110〉: this can be fitted rather well by a combination ofs andp phase shifts.

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Templeton, I.M. Fermi surface changes and electron scattering anisotropy in the potassium-rubidium alloy system. J Low Temp Phys 60, 85–108 (1985). https://doi.org/10.1007/BF00681655

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Keywords

  • Fermi Surface
  • Harmonic Coefficient
  • Real Nonlinearity
  • Anisotropy Change
  • Inversion Coefficient