Observation of Electronic Structure Modification in the Hidden Order Phase of CeCoSi
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866914692599906304 |
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| author | Kimura, Shin-ichi Watanabe, Hiroshi Tatsukawa, Shingo Tanida, Hiroshi |
| author_facet | Kimura, Shin-ichi Watanabe, Hiroshi Tatsukawa, Shingo Tanida, Hiroshi |
| contents | CeCoSi with no local inversion symmetric crystal structure ($P4/nmm$) exhibits a phase transition of unknown origin (Hidden Order: HO) at about 12 K ($T_0$) above the antiferromagnetic transition temperature ($T_{\rm N}=9.4$ K). The electronic structure change across $T_0$ was investigated with high-precision optical reflection spectroscopy. The optical spectrum changed from a typical metallic behavior above $T_0$ to a gap-like structure at around 15 meV below $T_0$. The gap-like structure was unchanged across $T_{\rm N}$ except for the narrowing of the Drude component of carriers due to the suppression of magnetic fluctuations. This result suggests a slight change from the typical metallic electronic structure above $T_0$ to that with an energy gap near the Fermi level in the HO phase. The change in electronic structure in the HO phase was concluded to be due to electron/valence instability. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2302_09749 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Observation of Electronic Structure Modification in the Hidden Order Phase of CeCoSi Kimura, Shin-ichi Watanabe, Hiroshi Tatsukawa, Shingo Tanida, Hiroshi Strongly Correlated Electrons CeCoSi with no local inversion symmetric crystal structure ($P4/nmm$) exhibits a phase transition of unknown origin (Hidden Order: HO) at about 12 K ($T_0$) above the antiferromagnetic transition temperature ($T_{\rm N}=9.4$ K). The electronic structure change across $T_0$ was investigated with high-precision optical reflection spectroscopy. The optical spectrum changed from a typical metallic behavior above $T_0$ to a gap-like structure at around 15 meV below $T_0$. The gap-like structure was unchanged across $T_{\rm N}$ except for the narrowing of the Drude component of carriers due to the suppression of magnetic fluctuations. This result suggests a slight change from the typical metallic electronic structure above $T_0$ to that with an energy gap near the Fermi level in the HO phase. The change in electronic structure in the HO phase was concluded to be due to electron/valence instability. |
| title | Observation of Electronic Structure Modification in the Hidden Order Phase of CeCoSi |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2302.09749 |