Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 106: Complex Oxides: Bulk Properties, Surfaces and Interfaces (joint session TT/MA/KFM)
TT 106.13: Vortrag
Freitag, 16. März 2018, 12:45–13:00, H 0110
Ultrahigh-resolution Resonant Inelastic X-ray Scattering from rare-earth nickelates: magnetic and dd-excitations — •Katrin Fürsich1, Yi Lu1, Davide Betto2, Georg Christiani1, Giniyat Khaliullin1, Maurits W. Haverkort3, Eva Benckiser1, Matteo Minola1, and Bernhard Keimer1 — 1Max-Planck-Institut für Festkörperforschung, Stuttgart — 2European Synchrotron Radiation Facility, Grenoble — 3Institut für Theoretische Physik, Universität Heidelberg
Rare-earth nickelates (RNiO3) have been subject to intense investigation, mostly because of the rich phase diagram comprising a sharp temperature-driven metal-to-insulator transition, an unusual antiferromagnetic ground state, and the prospect of mimicking the physics of high-Tc superconducting cuprates in orbitally engineered heterostructures. We have studied RNiO3 thin-films and superlattices using ultrahigh-resolution resonant inelastic x-ray scattering (RIXS) at the Ni L3 edge. Below the magnetic ordering temperature, we observe well-defined collective magnon excitations. Our experimental observation provides for the first time a solid basis for the theoretical description of the magnetism in RNiO3. In addition to magnetic excitations, we investigated the electronic excitations of RNiO3 as a function of temperature and tolerance factor, i.e. rare-earth radius. A sophisticated analysis based on an advanced double-cluster model gives intriguing insight into the microscopic and electronic structure of RNiO3. Our study reveals that RIXS is an excellent technique to quantitatively characterize different ordering phenomena within one material.