Regensburg 2025 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 58: f-Electron Systems and Heavy Fermions
TT 58.2: Talk
Friday, March 21, 2025, 11:45–12:00, H31
Complex magnetic order from multiple Ce–sites in CeRhSn2. — Petr Opletal1, Jan Fikáček1, Arumugam Thamizhavel2, Zakir Hossain3, Róbert Tarasenko4, Vladimír Tkáč4, and •Jeroen Custers1 — 1Charles University, MMF DCMP, Prague, Czech Republic — 2DCMP & MS, Tata Institute of Fundamental Research, Mumbai, India — 3Dept. of Physics, Indian Institute of Technology, Kanpur, India — 4Institute of Physics, Faculty of Science, P.J. Šafárik University, Košice, Slovak Republic
Previous reports on polycrystalline CeRhSn2 reveal different magnetic ground states being ferromagnetic (TC = 4 K) or antiferromagnetic (TN = 3.5 K). To elucidate we have grown a single crystal and conducted measurements of the magnetization (M), specific heat (Cp/T), and electrical resistivity (ρ). The compound crystallizes in the orthorhombic lattice structure with space group Cmcm characterized by the cell parameters a= 4.5905(10)Å, b= 16.9758(5)Å and c= 9.5924(3)Å. Moreover, it exhibits two crystallographic inequivalent Ce–sites with a zigzag chain of Ce–atoms running along the c–axis. Our measurements reveal an AFM phase transition at TM1 = 3.6 K manifesting by a strong decrease of the orthorhombic c–axis magnetization, while only a tiny cusp is notable along the other directions, a sharp discontinuity in Cp/T and a kink in ρ and a subsequent ferrimagnet–like (FIM) ordering at TM2 = 1.7 K visible by a λ-shape of peak in Cp/T and a sudden drop in the resistivity. We map out a B–T phase diagram for field B ∥ b–axis and follow the evolution of the transitions under hydrostatic pressure up to 3 GPa.
Keywords: Complex magentism; Frustration; Kondo lattice; Hydrostatic pressure; Multiple magnetic sites.