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We report a critical analysis of the electronic structures and de Haas–van Alphen (dHvA) quantities of the heavy-fermion superconductors , , and . The electronic structures are investigated ab initio on the basis of full-potential band-structure calculations, adopting both the scalar- and fully relativistic formulations within the framework of the local spin-density approximation (LSDA). In contrast to another recent study, in which a pronounced change of the Fermi surface due to relativistic effects and therefore the importance of relativistic interactions for the superconductivity was claimed, we find only minor relativistic modifications of the band structure in our calculations. The ab initio calculated dHvA quantities are in good agreement with experimental data for and , when we adopt the delocalized LSDA description for the states. For , however, a better agreement with experiment is …