Terahertz crystal electric field transitions in a Kondo-lattice antiferromagnet
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arXiv
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| Format: | Preprint |
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2024
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| author | Shee, Payel Yang, Chia-Jung Pandey, Shishir Kumar Nandy, Ashis Kumar Kulkarni, Ruta Thamizhavel, Arumugam Fiebig, Manfred Pal, Shovon |
| author_facet | Shee, Payel Yang, Chia-Jung Pandey, Shishir Kumar Nandy, Ashis Kumar Kulkarni, Ruta Thamizhavel, Arumugam Fiebig, Manfred Pal, Shovon |
| contents | 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 CeAg_2Ge_2, 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_17020 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Terahertz crystal electric field transitions in a Kondo-lattice antiferromagnet Shee, Payel Yang, Chia-Jung Pandey, Shishir Kumar Nandy, Ashis Kumar Kulkarni, Ruta Thamizhavel, Arumugam Fiebig, Manfred Pal, Shovon Strongly Correlated Electrons 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 CeAg_2Ge_2, 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. |
| title | Terahertz crystal electric field transitions in a Kondo-lattice antiferromagnet |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2401.17020 |