Dresden 2020 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 2: Superconductivity: Sample Preparation, Characterization, Properties and Electronic Structure

TT 2.8: Talk

Monday, March 16, 2020, 11:30–11:45, HSZ 103

The electronic structure of infinite-layer nickelates — •Matthias Hepting^1,8, 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 Shen^1,6, 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).