Berlin 2024 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 5: Nickelates I

TT 5.8: Vortrag

Montag, 18. März 2024, 11:30–11:45, H 3007

Synthesis and characterization of electron-doped nickelate single crystals — •Vignesh Sundaramurthy, Pascal Puphal, Masahiko Isobe, Bernhard Keimer, and Matthias Hepting — Max-Planck-Institut für Festkörperforschung, Stuttgart, Deutschland

Transition metal oxides with their strong interplay between the lattice, spin and charge degrees of freedom exhibit a plethora of interesting properties. One example are perovskite rare-earth nickelates that show electronic and magnetic ground states, tunable via change of structural parameters and charge carrier doping. Substitution of the rare-earth site by tetravalent Ce ions serves this purpose, potentially leading to novel physical properties. However, the single crystal growth of these highly distorted and electron-doped nickelates is challenging [1], which will be elaborated in this talk. Furthermore, we will present initial results of topotactic reductions of Ce-substituted nickelates, aiming for the realization of single crystals with the infinite-layer structure that are isostructural and isoelectronic to superconducting cuprates.

[1] P. Puphal, V. Sundaramurthy et al., APL Mater. 11 2023) 081107

Keywords: crystal-growth; perovskite; nickelates