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TT: Fachverband Tiefe Temperaturen
TT 58: f-Electron Systems and Heavy Fermions
TT 58.1: Talk
Friday, March 21, 2025, 11:30–11:45, H31
The in-plane magnetic anisotropy of the coupled antiferromagnetic and charge-multipolar orders in CeRh2As2 — •Konstantin Semeniuk1, Seunghyun Khim1, and Elena Hassinger1,2 — 1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2Dresden University of Technology, Institute for Solid State and Materials Physics, Dresden, Germany
The heavy-fermion superconductor CeRh2As2 displays multiple intriguing electronic orders (1,2). Besides two superconducting phases, the material also hosts a state called Phase I at temperatures below T0 = 0.5 K. Phase I exhibits magnetism (3), but the response of T0 to a magnetic field H along the ab plane of the tetragonal lattice is incompatible with conventional magnetic orders. In particular, while T0(H) is rather stable in Phase I, at a critical field Hcr the material transitions into Phase II, in which T0 rapidly increases with field.
We conducted a detailed investigation of the H-T phase diagram of CeRh2As2 for various in-plane field orientations. The behaviour of T0(H) is remarkably different for H||[100] and H||[110], with, respectively, suppression and enhancement of T0 in Phase I, as well as strong anisotropy of Hcr. In line with recent theoretical work (4), we regard Phase I as a unique case of coupled antiferromagnetic and charge-multipolar orders, and use our results to constrain the model.
[1] S. Khim et al., Science 373, 1012 (2021).
[2] D. Hafner et al., Phys. Rev. X 12, 011023 (2022).
[3] S. Khim et al., arXiv:2406.16575.
[4] B. Schmidt & P. Thalmeier, Phys. Rev. B 110, 075154 (2024).
Keywords: Heavy Fermions; Multipolar order; Magnetism; Kondo lattice; Superconductivity