Dresden 2026 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 98: Altermagnets

TT 98.2: Talk

Friday, March 13, 2026, 09:45–10:00, CHE/0091

Tuning the heavy fermion altermagnet candidate Ce₄Sb₃ by hydrostatic pressure — •Julian Kaiser¹, Bin Shen¹, Franziska Walther², Kristin Kliemt², Cornelius Krellner², Anton Jesche¹, and Philipp Gegenwart¹ — ¹EP VI, EKM, University of Augsburg, Germany — ²Physikalisches Institut, Goethe-Universität Frankfurt, Frankfurt am Main, Germany

Altermagnets have recently attracted significant attention because they have features of both ferromagnets and antiferromagnets in a novel symmetry framework, giving rise to unconventional electronic and spin-transport phenomena previously believed to be absent in traditional collinear antiferromagnets. The heavy-fermion compound Ce₄Sb₃ has been proposed as an altermagnetic candidate with nontrivial band topology [1], making it an ideal platform for investigating the interplay among magnetism, band topology, and the Kondo effect. To probe this interplay, we performed magnetization measurements under hydrostatic pressure and established a preliminary pressure-temperature phase diagram. Our results reveal that the magnetic order in Ce₄Sb₃ is highly sensitive to pressure and can be gradually suppressed. These findings identify Ce₄Sb₃ as a tunable altermagnetic candidate in which the balance between the Kondo effect and the RKKY interaction, and thus the magnetic order, can be effectively controlled by pressure.
[1] X. He and S. Zhang, Phys. Rev. B 112, 075138 (2025)

Keywords: heavy fermion systems; Kondo effect / RKKY interplay; altermagnetism; hydrostatic pressure; phase diagram