Dresden 2026 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 41: Focus Session: Nickelate Superconductivity: Insights into Unconventional Pairing and Correlation Effects II (joint session TT/DS/MA)

MA 41.5: Vortrag

Donnerstag, 12. März 2026, 10:30–10:45, HSZ/0003

Two-dimensional vortex matter in infinite-layer nickelates — •David Sanchez-Manzano¹, Vincent Humbert¹, Araceli Gutiérrez-Llorente^1,2, Dongxin Zhang¹, Jacobo Santamaría³, Manuel Bibes¹, Lucia Iglesias¹, and Javier E. Villegas¹ — ¹Laboratoire Albert Fert, CNRS, Thales, Univerisité Paris-Saclay, 91767 Palaiseau, France — ²Escuela Superior de Ciencias Experimentales y Tecnología, Universidad Rey Juan Carlos, 28933 Madrid, Spain — ³GFMC, Dpto. de Física de Materiales, Facultad de Ciencias Físicas, Universidad Complutense de Madrid, 28040 Madrid, Spain

Characterizing the dimensionality of the superconducting state in the infinite-layer (IL) nickelates is crucial to understanding its nature. Most studies have addressed the problem by studying the anisotropy of the upper critical fields. Yet, the dominance of Pauli-paramagnetism effects over orbital ones makes it challenging to interpret the experiments in terms of dimensionality. Here we address the question from a different perspective, by investigating the vortex phase diagram in the mixed-state. We demonstrate that superconducting Pr_0.8Sr_0.2NiO₂ thin films present a vortex liquid-to-glass transition of a two-dimensional nature. The obtained results suggest that bidimensionality is an intrinsic property, and that superconductivity resides in fully-decoupled NiO₂ planes. In this scenario, the coherence length along the c-axis must be shorter than the distance between those planes, while Josephson and magnetostatic coupling between them must be negligible. We believe that these conclusions are relevant for theories on the origin of superconductivity in the IL-nickelates.

Keywords: superconducting nickelates; vortex matter; strongly correlated systems