Terahertz crystal electric field transitions in a Kondo-lattice antiferromagnet

2024/01/30 by Payel Shee, Shee, Payel, Chia‐Jung Yang +13 · 1 citation
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Topological Materials and Phenomena #Advanced Condensed Matter Physics

paper · pdf · doi:10.48550/arxiv.2401.17020

Abstract

Hybridization between the localized f-electrons and the delocalized conduction electrons together with the crystal electric field (CEF) play a determinant role in governing the many-body ground state of a correlated-electron system. Here, we investigate the low-energy CEF states in CeAg₂Ge₂, a prototype Kondo-lattice antiferromagnet where Kondo correlation is found to exist within the antiferromagnetic phase. Using time-domain THz reflection spectroscopy, we show the first direct evidence of two low-energy CEF transitions at 0.6 THz (2.5 meV) and 2.1 THz (8.7 meV). The presence of low-frequency infrared-active phonon modes further manifests as a Fano-modified lineshape of the 2.1 THz CEF conductivity peak. The temporal spectral weights obtained directly from the THz time traces, in addition, corroborate the corresponding CEF temperature scales of the compound.

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