Berlin 2024 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 80: Correlated Electrons: Poster

TT 80.10: Poster

Donnerstag, 21. März 2024, 15:00–18:00, Poster E

Ce₂Ir₃Ga₅: A new locally non-centrosymmetric heavy fermion system — •Arushi Arushi, Raul Cardoso-Gil, and Christoph Geibel — Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany

Recently, a new type of unconventional superconductivity with a field-induced transition between two different superconducting (SC) states was discovered in the heavy fermion system CeRh₂As₂. This unusual SC state was proposed to be based on specific symmetries of the underlying structure, i.e., a globally centrosymmetric layered structure, but where the Ce-layers themselves lack inversion symmetry. This new type of SC state has attracted strong interest, prompting the search for further heavy fermion systems crystallizing in structures with appropriate symmetries. Here, I will present the discovery and the study of a new Ce-based heavy fermion system with a globally centrosymmetric structure but without inversion symmetry on the Ce-site, Ce₂Ir₃Ga₅. A single crystal X-ray diffraction study revealed an orthorhombic U₂Co₃Si₅ type structure. Resistivity, specific heat, and magnetization measurements indicate a moderate-heavy fermion behavior with a Kondo energy scale of the order of 40 K. Most experimental results suggest the absence of magnetic order, but a tiny anomaly in the specific heat opens the possibility for a very weak, itinerant type of ordering.

Keywords: Strongly correlated electron system; Heavy fermion