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TT: Fachverband Tiefe Temperaturen
TT 2: Superconductivity: Sample Preparation, Characterization, Properties and Electronic Structure
TT 2.8: Vortrag
Montag, 16. März 2020, 11:30–11:45, HSZ 103
The electronic structure of infinite-layer nickelates — •Matthias Hepting1,8, Danfeng Li1, Chunjing Jia1, Haiyu Lu1, Eugenio Paris2, Yi Tseng2, Xiao Feng1, Motoki Osada1, Emily Been1, Yasuyuki Hikita1, Yi-De Chuang3, Zahid Hussain3, Ke-Jin Zhou4, Abhishek Nag4, Mirian Garcia-Fernandez4, Matteo Rossi1, Hsiao-Yu Huang5, Di-Jing Huang5, Zhi-Xun Shen1,6, Thorsten Schmitt2, Harold Hwang1, Brian Moritz1, Jan Zaanen7, Thomas Devereaux1, and Wei-Sheng Lee1 — 1Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, USA — 2PSI, Switzerland — 3ALS, LBNL, USA — 4Diamond Light Source, United Kingdom — 5NSRRC, Hsinchu Science Park, Taiwan — 6Geballe Lab, Stanford University, USA — 7Instituut-Lorentz for Theoretical Physics, Leiden University, Netherlands — 8Max Planck Institute for Solid State Research, Germany
The recent discovery of superconductivity in the Sr-doped infinite-layer nickelate NdNiO2 has revived the search for materials with physical properties similar to cuprate high-temperature superconductors. We have used x-ray spectroscopy and density functional theory to show that the electronic structure of the undoped parent compound RNiO2 (R = La, Nd), while similar to the cuprates, includes significant distinctions [1]. The material can be regarded as a Kondo- or Anderson-lattice-like oxide-intermetallic, replacing the Mott insulator as the reference state from which superconductivity emerges upon doping.
[1] M. Hepting et al., arXiv:1909.02678 (2019).