Fermi surface investigations of the alkaline-earth-metal subnitride NaBa3Nby means of de Haas-van Alphen oscillations - art. no. 115104

de Haas-van Alphen oscillations are observed in the all;aline-earth-metal s ubnitride NaBa3N. They are studied at various sample orientations with resp ect to the magnetic-field direction. A rich spectrum of quantum oscillation frequencies varying with the held orientation is found. The effective cycl otron masses of the carriers are found to depend on the area enclosed by th e corresponding Fermi surface orbit, while the mean free path is: constant over the whole Fermi surface. Four of the detected frequencies are attribut ed to two lens-shaped features of the Fermi surface, as computed with the t ight-binding linear muffin-tin orbital method. Spin-orbit coupling is shown to play a crucial role in determining the topology of the respective orbit s in reciprocal space. The experimental results and the computed electronic structure are discussed with regard to the void metal model for the subnit ride.