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TT: Fachverband Tiefe Temperaturen

TT 11: Heavy Fermions

TT 11.3: Vortrag

Montag, 18. März 2024, 15:30–15:45, H 3005

Origin of the non-Fermi-liquid behavior in CeRh2As2 — •Pavlo Khanenko1, 2, Konstantin Semeniuk1, Daniel Hafner1, Jacintha Banda1, Thomas Lühmann1, Javier F. Landaeta1, Florian Bärtl3, Tommy Kotte3, Joachim Wosnitza2,3, Gertrud Zwicknagl4, Christoph Geibel1, Seunghyun Khim1, Elena Hassinger2, and Manuel Brando11Max Planck Institute for Chemical Physics of Solids, Germany — 2Institut für Festkörper- und Materialphysik, TU Dresden, Germany — 3Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence, Germany — 4Institute for Mathematical Physics, Technische Universität Braunschweig, Germany

Unconventional superconductivity appears near magnetic quantum critical points (QCPs). This seems to be the case also for CeRh2As2 which is a multi-phase heavy-fermion superconductor (Tc = 0.31 K). Furthermore, another ordered state is observed below T0 ≈ 0.48 K whose nature is unclear, possibly a quadrupolar order. In addition, NQR/NMR experiments have detected an antiferromagnetic order below Tc. The presence of a QCP is indicated by the non-Fermi-liquid (NFL) behavior observed above the ordered states in both the specific heat, C(T)/TT−0.6, and the resistivity, ρ(T) ∝ √T. Here, we present specific-heat measurements taken at a field applied at various angles α with respect to the crystallographic c axis. We observe that the NFL behavior depends very weakly on the field and on the angle α, a result that is at odds with that observed in standard magnetic QCPs. Possible origins for this unusual NFL behavior are discussed.

Keywords: Kondo effect; non-Fermi-liquid; unconventional superconductivity

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