The de Haas-van Alphen effect has been used to study the changes in Fermi surface (FS) dimensions and the electron scattering in dilute Rb(Cs) and Cs(Rb) alloys. The initial FS cross-section changes indicate that at each end of the system the actual lattice constant changes lie slightly below a linear interpolation between the host lattice constants. The changes in FS anisotropy are relatively large (up to −10−3 / at % in FS radius for Cs(Rb)): a phase-shift fit with a combination ofs andp terms gives a good representation of the changes in Rb(Cs), but that for Cs(Rb) is relatively poor. The electron scattering has less forward-scattering component than in the K-Rb system, the ratio xρ/x0 between the resistivity temperature and the average Dingle temperature being 0.73 in Rb(Cs) and 0.74 in Cs(Rb). The scattering rate anisotropies are large, 20% in Rb(Cs) and 63% in Cs(Rb). In both cases the maximum scattering rate occurs at 〈110〉. Phase-shift fits give a good representation of the scattering anisotropy at both ends of the alloy system: a combination ofs andp terms appears best for Rb(Cs) and ofs andd for Cs(Rb). However, these phase shifts give poor values for xρ/x0, and no agreement with a lattice-distortion prediction for the Friedel sum.
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Templeton, I.M. Fermi surface changes and electron scattering anisotropy in alkali metal alloys II. The rubidium-cesium system. J Low Temp Phys 66, 305–324 (1987). https://doi.org/10.1007/BF00682259
- Fermi Surface
- Good Representation
- Metal Alloy
- Electron Scattering