Regensburg 2025 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 52: Nickelates and Other Complex Oxides
TT 52.4: Talk
Friday, March 21, 2025, 10:15–10:30, H31
Uniaxial pressure dependencies of the metal-to-metal transition in P21 /a and Bmab La4Ni3O10 single crystals — •Lukas Gries, Jan Arneth, Ning Yuan, Ahmed Elghandour, and Rüdiger Klingeler — Kirchhoff Institut for Physics, Heidelberg, Germany
The n = 3 Ruddlesden-Popper nickelate La4Ni3O10 exhibits an intriguing metal-to-metal transition (MMT) accompanied by the evolution of intertwined charge and spin order [1]. We report report high-resolution capacitance dilatometry and magnetisation data on phase-pure single crystals of P21/a and Bmab La4Ni3O10 grown by the high-pressure floating-zone method [2]. Our data show pronounced magnetoelastic coupling at the MMT for both phases. The extracted uniaxial pressure dependencies are negative for the ab plane and positive along the c axis. The uniaxial pressure dependencies are quantified and the relevant energy scales are investigated via Grüneisen scaling and Ehrenfest analysis.
[1] J. Zhang et al., Nat. Commun. 11, 6003 (2020)
[2] N. Yuan, et al., J Cryst. Growth 627, 127511 (2024)
Keywords: Nickelates; Dilatometry; Thermal Expansion; Metal-to-Metal transition; Charge Density Wave