SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 50: Focus Session: Superconducting Nickelates II
TT 50.8: Vortrag
Donnerstag, 30. März 2023, 16:45–17:00, HSZ 03
High-pressure crystal growth and physical properties of Ruddlesden-Popper trilayer nickelates La4Ni3O10 — •Ning Yuan, Kaustav Dey, Jan Arneth, Ahmed Elghandour, and Rüdiger Klingeler — Kirchhoff Institute for Physics, Heidelberg University, Germany
Single crystals of La4Ni3O10 were successfully grown by the high-pressure optical floating-zone method under 20 bar oxygen pressure. We investigate the different growth and post-annealing processes leading to two different polymorphs, namely P21/a (No.14) and Bmab (No.64), respectively, and report high-resolution thermal expansion, specific heat and magnetometry data on both of them. Our thermodynamic studies show sharp anomalies associated with the reported Metal-to-Metal Transition (MMT) in La4Ni3O10 and distinct anisotropy. For the P21/a phase, the MMT transition is found at 134 K while it appears at 152 K for Bmab. Our thermal expansion data in particular confirm that the MMT transition is associated with strong lattice changes (cf. [1]) but is also reveals clear contradictions to the published XRD data [2].
[1] D. Rout et al., Phys. Rev. B 102, 195144 (2020)
[2] J. Zhang et al., Phys. Rev. M 4, 083402 (2020)