Regensburg 2019 – scientific programme

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MA: Fachverband Magnetismus

MA 15: Magnetism Poster A

MA 15.71: Poster

Tuesday, April 2, 2019, 10:00–13:00, Poster E

Ferromagnetic ordering and heavy fermion behavior in Ce₂Ru₃Ge₅ — Ramesh Kumar Kamadurai^1,2, Djoumessi Fobasso Redrisse², and •Andre M Strydom² — ¹Institute of Physics, Chinese Academy of Sciences, Beijing, China — ²Department of Physics, University of Johannesburg, South Africa

The series of intermetallic compounds Ce₂T₃Si₅ (T- Transition metal X - Si, Ge) exhibit wide range of magnetic behaviour such as magnetic ordering, heavy fermion behaviour and Kondo effect. We present the magnetic susceptibility (χ), specific heat (C_P), resistivity (ρ) thermopower (S) and magnetoresistivity (MR) properties of Ce₂Ru₃Ge₅. The refined lattice parameter was observed to be *a = 9.9497 (4) Å, b = 12.416 (4), Å c = 5.8978 (2) Å. By means of χ (T), C_P (T) ρ (T), S(T) and MR measurements we show that the system exhibits ferromagnetic-like long-range ordering below 7.9 K with localized Ce³⁺ ions and Sommerfeld coefficient γ = 85 mJ/mol.K. A strong influence of field dependent χ (T), ρ (T) and reduced saturation moment (0.32 µ_B) suggest that the crystalline electric field (CEF) plays a role in the ground state properties. The CEF splitting energies are estimated to be Δ₁ = 567 K and Δ₂ = 1491 K for the first and second excited states respectively. Absence of logarithmic variation of ρ_mag at low temperatures, negative MR at 2 K indicate that the Kondo energy scales are small (≈ 10 K) the system exhibit incoherent Kondo scattering.