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| Autori principali: | , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2412.12728 |
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| _version_ | 1866916700680617984 |
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| author | Liao, Zhiyu Li, Boxuan Yi, Shaohui Zheng, Lincong Wu, Yubiao Yi, Enkui Marsik, Premysl Shen, Bing Weng, Hongming Xu, Bing Qiu, Xianggang Bernhard, Christian |
| author_facet | Liao, Zhiyu Li, Boxuan Yi, Shaohui Zheng, Lincong Wu, Yubiao Yi, Enkui Marsik, Premysl Shen, Bing Weng, Hongming Xu, Bing Qiu, Xianggang Bernhard, Christian |
| contents | We report an infrared spectroscopy study of the antiferromagnetic (AFM) insulator EuZn$_2$As$_2$ over a broad frequency range, spanning temperatures both above and below the AFM transition $T_{\rm N} \simeq$ 20 K. The optical response reveals an insulating behavior, featuring two prominent infrared-active phonon modes at around 95 and 190 cm$^{-1}$, and two subtle absorption peaks at around 130 ($α$ peak) and 2700 cm$^{-1}$ ($β$ peak), along with a strong absorption edge rising around 9000 cm$^{-1}$ ($γ$ peak). Significantly, the temperature-dependent changes in these peaks show noticeable anomalies across the AFM transition, particularly the emergence of the $α$ peak and an unusual redshift of the $γ$ peak, suggesting a strong interaction between the charge excitations and the AFM order. Band structure calculations reveal that these anomalies arise from magnetization-induced band renormalizations, including shifts and foldings. Additionally, both phonon modes feature asymmetric Fano line shapes at low temperatures, with the 95 cm$^{-1}$ phonon mode exhibiting strong coupling to the fluctuations of Eu spins. These findings highlight a complex interplay of spin, charge, and lattice degrees of freedom in EuZn$_2$As$_2$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_12728 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Spectroscopic signatures of magnetization-induced band renormalization and strong spin-charge-lattice coupling in EuZn$_2$As$_2$ Liao, Zhiyu Li, Boxuan Yi, Shaohui Zheng, Lincong Wu, Yubiao Yi, Enkui Marsik, Premysl Shen, Bing Weng, Hongming Xu, Bing Qiu, Xianggang Bernhard, Christian Materials Science Strongly Correlated Electrons We report an infrared spectroscopy study of the antiferromagnetic (AFM) insulator EuZn$_2$As$_2$ over a broad frequency range, spanning temperatures both above and below the AFM transition $T_{\rm N} \simeq$ 20 K. The optical response reveals an insulating behavior, featuring two prominent infrared-active phonon modes at around 95 and 190 cm$^{-1}$, and two subtle absorption peaks at around 130 ($α$ peak) and 2700 cm$^{-1}$ ($β$ peak), along with a strong absorption edge rising around 9000 cm$^{-1}$ ($γ$ peak). Significantly, the temperature-dependent changes in these peaks show noticeable anomalies across the AFM transition, particularly the emergence of the $α$ peak and an unusual redshift of the $γ$ peak, suggesting a strong interaction between the charge excitations and the AFM order. Band structure calculations reveal that these anomalies arise from magnetization-induced band renormalizations, including shifts and foldings. Additionally, both phonon modes feature asymmetric Fano line shapes at low temperatures, with the 95 cm$^{-1}$ phonon mode exhibiting strong coupling to the fluctuations of Eu spins. These findings highlight a complex interplay of spin, charge, and lattice degrees of freedom in EuZn$_2$As$_2$. |
| title | Spectroscopic signatures of magnetization-induced band renormalization and strong spin-charge-lattice coupling in EuZn$_2$As$_2$ |
| topic | Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2412.12728 |