Fermi Surface in BaNi 2P 2

Abstract

We report measurements of the de Haas-van Alphen (dHvA) oscillation and a band structure calculation for the pnictide superconductor BaNi 2P 2, which is isostructural to BaFe 2As 2, the mother compound of the iron-pnictide high-T c superconductor (Ba 1- xK x)Fe 2As 2. Six dHvA-frequency branches with frequencies up to ̃8 kT were observed, and they are in excellent agreement with results of the band-structure calculation. The determined Fermi surface is large, enclosing about one electron and hole per formula unit, and three-dimensional. This is in contrast to the small two-dimensional Fermi surface expected for the iron-pnictide high-T c superconductors. The mass enhancement is about two.