Regensburg 2025 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 3: Correlated Magnetism – General

TT 3.7: Vortrag

Montag, 17. März 2025, 11:00–11:15, H32

Pressure tuning of ferromagnetism in the Kagome metal
CrNiAs — •Bin Shen¹, Franziska Breitner¹, Victoria A. Ginga², Philipp Gegenwart¹, and Alexander A. Tsirlin² — ¹EP VI, EKM, University of Augsburg, Germany — ²Felix Bloch Institute, University of Leipzig, Germany

Ferromagnetic Kagome metals attract considerable interest as quantum materials with nontrivial topological electronic states. Here, we present our extensive study on single crystals of CrNiAs, crystallizing in a hexagonal structure with space group of P62m, featuring a distored kagome lattice of magnetic Cr. CrNiAs undergoes a ferromagnetic phase transition at T_C = 135 K, where the c-axis is the easy axis. At T^⋆ = 90 K another phase transition is found, likely driven by magnetism, associated with a shrinkage of the c-axis while the ab-plane expands. Anomalous Hall effect is observed in the magnetically ordered state of CrNiAs. We also report the pressure tuning of ferromagnetism.

Supported by DFG-TRR 360-492547816 and the Alexander von Humboldt Foundation.

Keywords: kagome metal; ferromagnetism; pressure