ARPES Study of Triple Layer Nickelate R$_{4}$Ni$_{3}$O$_{10}$ (R=Pr, La)

Layered nickelates present a similar crystal and electronic structure to the high-T$_c$ cuprates. They are potential candidates to host superconductivity, and have demonstrated intriguing anomalies in resistivity, magnetic susceptibility, and specific heat [1-3]. Here we present an ARPES study of the triple layer nickelate R$_{4}$Ni$_{3}$O$_{10}$ (R=Pr, La) and compare it with density functional calculations. A large hole pocket centered at the zone corners similar to the cuprates is observed, with additional zone folding due to the structural/magnetic cell doubling. An additional band-like feature is found near the Fermi surface at the gamma point, and shows a different symmetry than that of the hole pocket. These details of the fermiology and their relevance to the properties of these materials will be discussed. [1] Z. Zhang et al. J. Solid State Chem. 117, 236 (1995). [2] M. D. Carvalho et al. J. Appl. Phys. 88, 544 (2000). [3] M. Zinkevich et al. J. Alloys Compd. 438, 92 (2007).