Hybridization Dynamics in CeCoIn5 Revealed by Ultrafast Optical Spectroscopy
| Autor: | Chong Yang Chen, Yun Liu, Z. X. Wei, J. J. Dong, Hanoh Lee, W. L. Zhang, Huiqiu Yuan, Jingbo Qi, Yong-Ju Zhang, Yang Yang |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Physical Review Letters. 124 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.124.057404 |
| Popis: | We investigate the quasiparticle dynamics in the prototypical heavy fermion ${\mathrm{CeCoIn}}_{5}$ using ultrafast optical pump-probe spectroscopy. Our results indicate that this material system undergoes hybridization fluctuations before the establishment of heavy electron coherence, as the temperature decreases from $\ensuremath{\sim}120\text{ }\text{ }\mathrm{K}$ (${T}^{\ifmmode\dagger\else\textdagger\fi{}}$) to $\ensuremath{\sim}55\text{ }\text{ }\mathrm{K}$ (${T}^{*}$). We reveal that the anomalous coherent phonon softening and damping reduction below ${T}^{*}$ are directly associated with the emergence of collective hybridization. We also discover a distinct collective mode with an energy of $\ensuremath{\sim}8\text{ }\text{ }\mathrm{meV}$, which may be experimental evidence of the predicted unconventional density wave. Our findings provide important information for understanding the hybridization dynamics in heavy fermion systems. |
| Databáze: | OpenAIRE |
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