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TT: Fachverband Tiefe Temperaturen

TT 7: Correlated Electrons: Electronic Structure Calculations

TT 7.9: Vortrag

Montag, 17. März 2025, 17:15–17:30, H31

Electronic structure of CrB₂ and implications for the incommensurate antiferromagnetic order — •André Deyerling¹, Alexander Regnat¹, Schorsch Sauther¹, Christian Pfleiderer^1,2,3,4, and Marc A. Wilde^1,2 — ¹Physik Department, TUM School of Natural Sciences, Technische Universität München, Germany — ²Zentrum für Quantum Engineering (ZQE), Technische Universität München, Germany — ³Munich Center for Quantum Science and Technology (MCQST), Technische Universität München, Germany — ⁴Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Germany

CrB₂ exhibits antiferromagnetic order below T_N=89 K [1]. Applying pressure leads to the suppression of magnetic order and the onset of superconductivity [2,3,4]. We report ab initio calculations of CrB₂ for different pressures and discuss possible mechanisms leading to the suppression of magnetic order and the onset of superconductivity. In addition we discuss the electronic structure for different possible magnetic ground states and their compatibility with neutron scattering experiments [4] and quantum oscillation measurements [5,6].

[1] A. Bauer et al., PRB 90, 064414 (2014).

[2] C. Pei et al., arXiv:2109.15213 (2021).

[3] S. Biswas et al., PRB 108, L020501 (2023).

[4] A. Regnat, PhD thesis, TUM (2019).

[5] M. Brasse et al., PRB 88, 155138 (2013).

[6] S. Sauther, PhD thesis, TUM (2021).

Keywords: Fermi Surface; Superconductivity; Antiferromagnetism; Electronic Structure