Abstract
We report the ultrafast optical pump-probe spectroscopy measurements on the single-crystal cerium films. Our experimental results of temperature-dependent quasiparticle dynamics reveal development of the hybridization between localized f moments and conduction electrons, i.e., evolving from fluctuating hybridization to collective hybridization. Exotic phonon renormalization is discovered to appear at the emerging temperature (T†) of fluctuating hybridization apart from its known presence at the coherent temperature (T*), and can hardly be explained by the mean-field theory. The quasiparticle relaxation at high temperatures indicates coexistence of nonthermal electron-electron scattering and inelastic Kondo scattering, while its behavior at low temperatures suggests onset of α phase in the γ-phase dominated film. We also extract the indirect gap below T*, representing the appearance of collective hybridization. Our findings provide novel information about the hybridization and phase evolution in the heavy fermion systems.
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This work was supported by the National Key Research and Development Program of China (Grant Nos. 2022YFA1403000, and 2022YFA1402200), the National Natural Science Foundation of China (Grant Nos. 92365102, 11974070, 11734006, 11925408, 11921004, 12004067, 62027807, and 12174331), and the Frontier Science Project of Dongguan (Grant No. 2019622101004).
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Pei, Y., Wu, Y., Hu, K. et al. Hybridization-mediated quasiparticle and phonon dynamics in single crystal cerium films. Sci. China Phys. Mech. Astron. 67, 247412 (2024). https://doi.org/10.1007/s11433-023-2289-0
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DOI: https://doi.org/10.1007/s11433-023-2289-0