Pressure-induced superconductivity reentrant in transition metal dichalcogenide TiSe2
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2022
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| author | Xia, Wei Wu, Jiaxuan Li, Zhongyang Yuan, Jian An, Chao Wang, Xia Yu, Na Zou, Zhiqiang Liu, Gang Zhou, Chunyin Feng, Jiajia Zhang, Lili Dong, Zhaohui Chen, Bin Yang, Zhaorong Yu, Zhenhai Chen, Hanghui Guo, Yanfeng |
| author_facet | Xia, Wei Wu, Jiaxuan Li, Zhongyang Yuan, Jian An, Chao Wang, Xia Yu, Na Zou, Zhiqiang Liu, Gang Zhou, Chunyin Feng, Jiajia Zhang, Lili Dong, Zhaohui Chen, Bin Yang, Zhaorong Yu, Zhenhai Chen, Hanghui Guo, Yanfeng |
| contents | Through either elements intercalation or application of pressure, transition metal dichalcogenide 1T-TiSe2 exhibits superconductivity in proximity to a charge density wave (CDW) quantum critical point (QCP), thus providing an ideal avenue to study the correlation between the two symmetry-breaking exotic quantum electronic states. We report herein that, in addition to the well-known superconducting dome that emerges within the low pressure range of 2 - 4 GPa and peaks with the maximal Tc of about 1.8 K, the pressure induces another separate superconducting transition starting around 15 GPa with a substantially higher Tc that reaches 5.6 K at about 21.5 GPa. The high-pressure X-ray diffraction and Raman spectroscopy measurements unveil that the superconductivity reentrant is caused by a first-order structural phase transition (from P-3m1 space group to Pnma space group), which is also supported by the density functional theory calculation. A comparative theoretical calculation also reveals that the conventional phonon-mediated mechanism can account for the superconductivity of 1T-TiSe2 under low pressure, while the electron-phonon coupling of 4O-TiSe2 under high pressure is too weak to induce the superconductivity with a Tc as high as 5.6 K. This implies that the emergent superconductivity in the 4O-TiSe2 may have an unconventional origin. Our finding would open a new window toward the discovery of more exotic quantum states in transition metal dichalcogenides via high pressure. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2202_06244 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Pressure-induced superconductivity reentrant in transition metal dichalcogenide TiSe2 Xia, Wei Wu, Jiaxuan Li, Zhongyang Yuan, Jian An, Chao Wang, Xia Yu, Na Zou, Zhiqiang Liu, Gang Zhou, Chunyin Feng, Jiajia Zhang, Lili Dong, Zhaohui Chen, Bin Yang, Zhaorong Yu, Zhenhai Chen, Hanghui Guo, Yanfeng Superconductivity Through either elements intercalation or application of pressure, transition metal dichalcogenide 1T-TiSe2 exhibits superconductivity in proximity to a charge density wave (CDW) quantum critical point (QCP), thus providing an ideal avenue to study the correlation between the two symmetry-breaking exotic quantum electronic states. We report herein that, in addition to the well-known superconducting dome that emerges within the low pressure range of 2 - 4 GPa and peaks with the maximal Tc of about 1.8 K, the pressure induces another separate superconducting transition starting around 15 GPa with a substantially higher Tc that reaches 5.6 K at about 21.5 GPa. The high-pressure X-ray diffraction and Raman spectroscopy measurements unveil that the superconductivity reentrant is caused by a first-order structural phase transition (from P-3m1 space group to Pnma space group), which is also supported by the density functional theory calculation. A comparative theoretical calculation also reveals that the conventional phonon-mediated mechanism can account for the superconductivity of 1T-TiSe2 under low pressure, while the electron-phonon coupling of 4O-TiSe2 under high pressure is too weak to induce the superconductivity with a Tc as high as 5.6 K. This implies that the emergent superconductivity in the 4O-TiSe2 may have an unconventional origin. Our finding would open a new window toward the discovery of more exotic quantum states in transition metal dichalcogenides via high pressure. |
| title | Pressure-induced superconductivity reentrant in transition metal dichalcogenide TiSe2 |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2202.06244 |