Split Fermi surface properties based on the relativistic effect in superconductor PdBiSe with the cubic chiral crystal structure

We grew single crystals of PdBiSe with the ullmannite-type cubic chiral structure and carried out de Haas–van Alphen (dHvA) experiments to clarify the Fermi surface properties. The Fermi surfaces are found to split into two different Fermi surfaces, reflecting the non-centrosymmetric crystal structure. A splitting energy between two nearly spherical Fermi surfaces named α and α' is determined as 1050–1260 K. These Fermi surfaces are identified to be due the band-149 and -150 electron Fermi surfaces centered at the Γ point from the results of full-potential linearized augmented plane wave (FLAPW) energy band calculations under consideration of a mass correction in the spin–orbit interaction for Bi-6p electrons based on the relativistic effect. The theoretical splitting energy between these Fermi surfaces is 1080–1150 K, which is in good agreement with the experimental value. (author)