Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 5: Nickelates I
TT 5.9: Talk
Monday, March 18, 2024, 11:45–12:00, H 3007
Orbital imaging of Ni3d states in the infinite-layer nickelate LaNiO2 — •Edgar Abarca Morales1, Vignesh Sundaramurthy2, Georg Poelchen1, Martin Sundermann1,3, Hlynur Gretarsson1,3, Pascal Phupal2, Matthias Hepting2, Hao Tjeng1, and Berit Goodge1 — 1MPI for Chemical Physics of Solids, Dresden, DE — 2MPI for Solid State Research, Stuttgart, DE — 3DESY, Hamburg, DE
The motivation for comparing nickelates and cuprate high-Tc superconductors has been strongly justified by the discovery of superconductivity in doped infinite-layer NdNiO2 [1], which is isostructural and with the same electron count (3d9) as the cuprate analogue. However, apart from the considerable lower Tc in the nickelate, recent studies have shown that its electronic structure differs significantly from the cuprate [2-4]. Hence, direct observation of the nickelate electronic structure has become of central need. Orbital imaging through non-resonant inelastic x-ray scattering (sNIXS) has been recently used to directly probe the ground state of Ni in NiO [5]. Here we employ sNIXS to reveal the charge density around the Ni-site in LaNiO2, proving that the 3d hole structure is compatible with having an eg symmetry. Moreover, we show that sNIXS is ideal to probe the ground state of other nickelates if efforts are taken towards the synthesis of single-crystalline samples.
[1] D. Li et al., Nature 572 (2019) 624
[2] M. Hepting et al., Nat. Mater. 19 (2020) 381
[3] B.H. Goodge et al., PNAS 118 (2021) e2007683118
[4] H. Lu et al., Science 373 (2021) 213
[5] H. Yavas et al., Nat. Phys. 15 (2019) 559
Keywords: Infinite-layer nickelates, sNIXS