Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 52: Heavy Fermions
TT 52.2: Talk
Wednesday, March 11, 2026, 15:15–15:30, HSZ/0103
Coupled magnetic and quadrupolar order in tetragonal CeRh2As2 evidenced by the basal-plane anisotropy — •Konstantin Semeniuk1,2, Burkhard Schmidt2, Seunghyun Khim2, and Elena Hassinger1,2 — 1Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany — 2Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
Unconventional superconductivity in Ce-based Kondo-lattice materials has been known to emerge exclusively in the vicinity of weak dipolar magnetic orders, while higher-order multipolar orders are only known to occur in a few Pr-based unconventional superconductors and possibly URu2Si2. Moreover, for tetragonal Ce-based compounds, quadrupolar orders are disfavoured by a two-fold degenerate ground state of the crystal electric field scheme, in contrast to a four-fold degenerate one in cubic systems. The multiphase superconductor CeRh2As2 appears to be a notable exception from both of these trends by possibly hosting coupled magnetic and quadrupolar orders. In this talk, we explain how such a scenario can be realised [1,2] and show that the field-temperature phase diagram of CeRh2As2 has a pronounced basal-plane anisotropy, which effectively proves the existence of higher-order multipolar ordering and raises questions regarding its role in the superconducting pairing.
[1] D. Hafner et al., Phys. Rev. X, 12, 011023 (2022).
[2] B. Schmidt, P. Thalmeier, Phys. Rev. B 110, 075154 (2024).
Keywords: Multipolar order; Quadrupolar order; Strong correlations; Kondo; Unconventional superconductivity