Nematic-fluctuation-mediated superconductivity in CuxTiSe2
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866912800756989952 |
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| author | Lv, Xingyu Fu, Yang Tian, Shangjie Ma, Ying Wang, Shouguo Petrovic, Cedomir Zhang, Xiao Lei, Hechang |
| author_facet | Lv, Xingyu Fu, Yang Tian, Shangjie Ma, Ying Wang, Shouguo Petrovic, Cedomir Zhang, Xiao Lei, Hechang |
| contents | The interplay among electronic nematicity, charge density wave, and superconductivity in correlated electronic systems has induced extensive research interest. Here, we discover the existence of nematic fluctuations in TiSe2 single crystal and investigate its evolution with Cu intercalation. It is observed that the elastoresistivity coefficient mEg exhibits a divergent temperature dependence following a Curie-Weiss law at high temperature. Upon Cu intercalation, the characteristic temperature T* of nematic fluctuation is progressively suppressed and becomes near zero when the superconductivity is optimized. Further intercalation of Cu leads to the sign change of T* and the suppression of superconductivity. These results strongly indicate that nematic phase transition may play a vital role in enhancing superconductivity in CuxTiSe2. Therefore, CuxTiSe2 provides a unique material platform to explore the nematic-fluctuation-mediated superconductivity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_00723 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Nematic-fluctuation-mediated superconductivity in CuxTiSe2 Lv, Xingyu Fu, Yang Tian, Shangjie Ma, Ying Wang, Shouguo Petrovic, Cedomir Zhang, Xiao Lei, Hechang Superconductivity Strongly Correlated Electrons The interplay among electronic nematicity, charge density wave, and superconductivity in correlated electronic systems has induced extensive research interest. Here, we discover the existence of nematic fluctuations in TiSe2 single crystal and investigate its evolution with Cu intercalation. It is observed that the elastoresistivity coefficient mEg exhibits a divergent temperature dependence following a Curie-Weiss law at high temperature. Upon Cu intercalation, the characteristic temperature T* of nematic fluctuation is progressively suppressed and becomes near zero when the superconductivity is optimized. Further intercalation of Cu leads to the sign change of T* and the suppression of superconductivity. These results strongly indicate that nematic phase transition may play a vital role in enhancing superconductivity in CuxTiSe2. Therefore, CuxTiSe2 provides a unique material platform to explore the nematic-fluctuation-mediated superconductivity. |
| title | Nematic-fluctuation-mediated superconductivity in CuxTiSe2 |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2601.00723 |