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TT: Fachverband Tiefe Temperaturen

TT 25: f-Electron Systems

TT 25.1: Vortrag

Dienstag, 10. März 2026, 09:30–09:45, HSZ/0101

Strong correlations in rare earth intermetallic compounds — •Payel Shee¹, Chia Jung Yang², Tanaya Halder¹, Nainish Tickoo¹, Shishir Kumar Pandey³, Ashis Kumar Nandy¹, Ruta Kulkarni⁴, Arumugam Thamizhavel⁴, Manfred Fiebig², Anamitra Mukherjee¹, and Shovon Pal¹ — ¹National Institute of Science Education and Research, Bhubaneswar, India — ²ETH Zurich, Zurich, Switzerland — ³Artificial Intelligence for Science Institute, Beijing, China — ⁴Tata Institute of Fundamental Research, Mumbai, India

In rare-earth intermetallic compounds, the strong correlations between magnetic ordering and the crystal electric field (CEF) are essential to understand their many-body ground states. The CEF excitations at a low energy scale becomes crucial to study as it leaves its fingerprints on the exotic magnetic behaviour in rare-earth intermetallics. Using THz time-domain spectroscopy, we have directly probed the underlying CEF states in two distinct material system: a prototype Kondo lattice system (CeAg₂Ge₂) and a metallic ferromagnet (PrSi). In CeAg₂Ge₂, we elucidate the low lying CEF state to strongly couple with the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction, evidenced by a distinct blueshift in the transition frequency [1]. However, in PrSi, we identify a prominent increase in the population of the higher CEF state at the curie temperature, showcasing an intricate interplay between CEF and magnetic ordering in these strongly correlated systems[2].
[1] P. Shee et al., Phys. Rev. B 109, 075133 (2024)
[2] P. Shee et al. manuscript submitted to Advanced Science.

Keywords: Strongly-correlated materials; Terahertz (THz) spectroscopy; Heavy-fermions; Metallic ferromagnet; Quantum phase transition