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arXiv · 2209.10169

Coupling of optical phonons with Kondo effect and magnetic orders in antiferromagnetic Kondo lattice CeAuSb$_2$

Yin-Zou Zhao·Qi-Yi Wu·Chen Zhang·Bo Chen·Wei Xia·Jiao-Jiao Song·Ya-Hua Yuan·Hao Liu·Fan-Ying Wu·Xue-Qing Ye·Hong-Yi Zhang·Han Huang·Hai-Yun Liu·Yu-Xia Duan·Yan-Feng Guo·Jun He·Jian-Qiao Meng
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Abstract

Ultrafast optical spectroscopy was used to investigate the ultrafast quasiparticle dynamics of antiferromagnetic Kondo lattice CeAuSb$_2$ as a function of temperature and fluence. Our results reveal (i) the opening of a narrow hybridization gap ($\Delta$ $\sim$ 4.5 meV) near the Fermi level below the coherence temperature $T^*$ $\approx$ 100 K, (ii) the coupling of coherent phonon modes with Kondo effect and magnetic orders, leading to the frequencies anomaly at the characteristic temperatures, and (iii) a possible photoinduced nonthermal phase transition. Our observations thus shed light on the hybridization dynamics and magnetic orders in heavy fermion systems.

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Yin-Zou Zhao, Qi-Yi Wu, Chen Zhang, Bo Chen, Wei Xia, Jiao-Jiao Song, Ya-Hua Yuan, Hao Liu, Fan-Ying Wu, Xue-Qing Ye, Hong-Yi Zhang, Han Huang, Hai-Yun Liu, Yu-Xia Duan, Yan-Feng Guo, Jun He, Jian-Qiao Meng. 2022-09-21. Coupling of optical phonons with Kondo effect and magnetic orders in antiferromagnetic Kondo lattice CeAuSb$_2$. https://doi.org/10.1103/physrevb.108.075115

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