SKM 2023 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 44: Focus Session: Superconducting Nickelates I

TT 44.8: Talk

Thursday, March 30, 2023, 12:45–13:00, HSZ 03

Synthesis and physical properties of perovskite and infinite-layer nickelate crystals — •Pascal Puphal¹, Vignesh Sundaramurthy¹, Valentin Zimmermann¹, Björn Wehinger², Gaston Garbarino², Kathrin Küster¹, Ulrich Starke¹, Jürgen Nuss¹, Bernhard Keimer¹, Masahiko Isobe¹, and Matthias Hepting¹ — ¹Max Planck Institute for Solid State Research — ²European Synchrotron Radiation Facility

Infinite-layer (IL) nickelates are an emerging family of superconductors whose synthesis in thin film form is an established process by now, whereas the growth of their bulk counterparts remains a formidable challenge. In a previous study, we achieved the reduction of perovskite La1-xCaxNiO3 single-crystals grown by a flux method under high external pressure to the IL phase La_1−xCa_xNiO₂ [1]. The typical lateral dimension of these crystals was 150 µm. As an advanced approach, we recently accomplished the reduction of millimeter-sized LaNiO₃ crystals obtained by optical floating zone growth under high oxygen gas pressure to the IL phase LaNiO₂ [2]. We will present our characterization of the crystalline, magnetic, and electronic properties of the LaNiO₂ crystals, and give an outlook on the synthesis of millimeter-sized crystals of pure LaNiO₃ and PrNiO₃ as well as ones with hole- and electron doping.
[1] P. Puphal et al., Sci. Adv. 7, eabl8091 (2021)
[2] P. Puphal et al., arXiv:2209.12787 (2022)