Regensburg 2022 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 22: Unconventional Superconductors
TT 22.9: Vortrag
Mittwoch, 7. September 2022, 17:45–18:00, H10
Importance of electronic correlations in nickelates — •Paul Worm1, Liang Si1, Motoharu Kitatani2, Ryotaro Arita3,4, and Karsten Held1 — 1Institute of Solid State Physics, TU Wien, 1040 Vienna, Austria — 2Department of Material Science, University of Hyogo, Ako, Hyogo 678-1297, Japan — 3RIKEN Center for Emergent Matter Sciences (CEMS), Wako, Saitama, 351-0198, Japan — 4Research Center for Advanced Science and Technology, University of Tokyo, Komaba, Tokyo, 153-8904, Japan
Motivated by the recent discovery of superconductivity in the pentalayer nickelate Nd6Ni5O12 [1], we calculate its electronic structure and superconducting critical temperature. First we analyse the compound by means of state of the art density functional theory and dynamical mean field theory (DFT+DMFT) and find that electronic correlations remove the Nd pockets from the Fermi surface, which crucially changes the filling of the Ni dx2−y2 band. An effective single-orbital Hamiltonian can be constructed for the five layers and we show that it’s properties are stunningly similar to the infinite layer case. Subsequently we solve this effective model within the dynamical vertex approximation to determine the transition temperature. We further study the related bilayer nickelate and propose a suitable dopant to achieve a doping level where superconductivity is expected.
[1] Nature Materials 10.1038
[2] P. Worm et al., arXiv:2111.12697 (2021)
[3] K. Held et al., Front. Phys. 9:810394 (2021)