Dutta, Rajesh; Maity, Avishek; Marsicano, Anna; Stewart, J. Ross; Opel, Matthias; Paulus, Werner: Revealing the effect of interstitial oxygen on the low-energy crystal electric field excitations of Pr(3+) in 214-nickelates. American Physical Society 2022Physical Review B: 105. https://www.doi.org/10.1103/PhysRevB.105.195147