Cascade of pressure-driven phase transitions in the topological nodal-line superconductor PbTaSe2

Tahir Murtaza; Haiyang Yang; Jiajia Feng; Yi Shen; Yongheng Ge; Yi Liu; Chunqiang Xu; Wenhe Jiao; Yaokang Lv; Christopher J. Ridley; Craig L. Bull; Pabitra K. Biswas; Raman Sankar; Wei Zhou; Bin Qian; Xuefan Jiang; Zhenjie Feng; Yonghui Zhou; Ziming Zhu; Zhaorong Yang; Xiaofeng Xu

doi:10.1103/PhysRevB.106.L060501

Cascade of pressure-driven phase transitions in the topological nodal-line superconductor PbTaSe2

Tahir Murtaza, Haiyang Yang, Jiajia Feng, Yi Shen, Yongheng Ge, Yi Liu, Chunqiang Xu, Wenhe Jiao, Yaokang Lv, Christopher J. Ridley, Craig L. Bull, Pabitra K. Biswas, Raman Sankar, Wei Zhou, Bin Qian, Xuefan Jiang, Zhenjie Feng, Yonghui Zhou, Ziming Zhu, Zhaorong YangXiaofeng Xu

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Abstract

We report a succession of pressure-tuned structural transitions in the topological nodal-line superconductor PbTaSe2, evidenced from synchrotron x-ray diffraction, elastic neutron scattering, Raman spectroscopy, and electrical transport measurements up to 56 GPa, accompanied by first-principles calculations to uncover the evolution of the underlying electronic structure. In contrast to the previously proposed small shift of the Pb Wyckoff coordinate in the sub-GPa regime, our study reveals that it is rather a transition from P6¯m2 (α phase) to P63mc (β phase), subsequently followed by a transition to P6/mmm (γ phase) at ∼7.5 GPa and to Pmmm (δ phase) at ∼44 GPa. In addition, the first-principles calculations unambiguously demonstrate the multiple types of topological fermions associated with these different pressure-driven structures. Collectively, our results not only present the intriguing structural transitions in this topological PbTaSe2 superconductor, they also provide the impetus to study topological phase transitions and their physical consequences in a broader class of topological materials.

Original language	English
Article number	L060501
Journal	Physical Review B
Volume	106
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.106.L060501
State	Published - Aug 1 2022
Externally published	Yes

Funding

The authors would like to thank Nigel Hussey, Michael Smidman, Xin Lu, Yu Song, Dong Qian, Xiangang Wan, and Bin Li for valuable discussions, and thank Xiaolong Li for the technical support. This research was supported by National Natural Science Foundation of China under Grants No. 11974061 and No. U1832147. The synchrotron XRD under pressure was performed in the Beamline BL15U1 of the Shanghai Synchrotron Radiation Facility (SSRF). R.S. acknowledges the financial support provided by the Ministry of Science and Technology (MOST), Taiwan, under Grants No. MOST-110-2112-M-001-065-MY3 and No. 111WIA0110339 and Academia Sinica for the budget of AS-iMATE-19-111. Z.Z. was supported by the National Natural Science Foundation of China (Grant No. 11704117), the Hunan Provincial Natural Science Foundation of China (Grant No. 2022JJ30370), and the Project of Educational Commission of Hunan Province of China (Grant No. 21A0066).

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Murtaza, T., Yang, H., Feng, J., Shen, Y., Ge, Y., Liu, Y., Xu, C., Jiao, W., Lv, Y., Ridley, C. J., Bull, C. L., Biswas, P. K., Sankar, R., Zhou, W., Qian, B., Jiang, X., Feng, Z., Zhou, Y., Zhu, Z., ... Xu, X. (2022). Cascade of pressure-driven phase transitions in the topological nodal-line superconductor PbTaSe2. Physical Review B, 106(6), Article L060501. https://doi.org/10.1103/PhysRevB.106.L060501

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title = "Cascade of pressure-driven phase transitions in the topological nodal-line superconductor PbTaSe2",

abstract = "We report a succession of pressure-tuned structural transitions in the topological nodal-line superconductor PbTaSe2, evidenced from synchrotron x-ray diffraction, elastic neutron scattering, Raman spectroscopy, and electrical transport measurements up to 56 GPa, accompanied by first-principles calculations to uncover the evolution of the underlying electronic structure. In contrast to the previously proposed small shift of the Pb Wyckoff coordinate in the sub-GPa regime, our study reveals that it is rather a transition from P6¯m2 (α phase) to P63mc (β phase), subsequently followed by a transition to P6/mmm (γ phase) at ∼7.5 GPa and to Pmmm (δ phase) at ∼44 GPa. In addition, the first-principles calculations unambiguously demonstrate the multiple types of topological fermions associated with these different pressure-driven structures. Collectively, our results not only present the intriguing structural transitions in this topological PbTaSe2 superconductor, they also provide the impetus to study topological phase transitions and their physical consequences in a broader class of topological materials.",

author = "Tahir Murtaza and Haiyang Yang and Jiajia Feng and Yi Shen and Yongheng Ge and Yi Liu and Chunqiang Xu and Wenhe Jiao and Yaokang Lv and Ridley, {Christopher J.} and Bull, {Craig L.} and Biswas, {Pabitra K.} and Raman Sankar and Wei Zhou and Bin Qian and Xuefan Jiang and Zhenjie Feng and Yonghui Zhou and Ziming Zhu and Zhaorong Yang and Xiaofeng Xu",

note = "Publisher Copyright: {\textcopyright} 2022 American Physical Society.",

year = "2022",

month = aug,

day = "1",

doi = "10.1103/PhysRevB.106.L060501",

language = "English",

volume = "106",

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Murtaza, T, Yang, H, Feng, J, Shen, Y, Ge, Y, Liu, Y, Xu, C, Jiao, W, Lv, Y, Ridley, CJ, Bull, CL, Biswas, PK, Sankar, R, Zhou, W, Qian, B, Jiang, X, Feng, Z, Zhou, Y, Zhu, Z, Yang, Z & Xu, X 2022, 'Cascade of pressure-driven phase transitions in the topological nodal-line superconductor PbTaSe2', Physical Review B, vol. 106, no. 6, L060501. https://doi.org/10.1103/PhysRevB.106.L060501

TY - JOUR

T1 - Cascade of pressure-driven phase transitions in the topological nodal-line superconductor PbTaSe2

AU - Murtaza, Tahir

AU - Yang, Haiyang

AU - Feng, Jiajia

AU - Shen, Yi

AU - Ge, Yongheng

AU - Liu, Yi

AU - Xu, Chunqiang

AU - Jiao, Wenhe

AU - Lv, Yaokang

AU - Ridley, Christopher J.

AU - Bull, Craig L.

AU - Biswas, Pabitra K.

AU - Sankar, Raman

AU - Zhou, Wei

AU - Qian, Bin

AU - Jiang, Xuefan

AU - Feng, Zhenjie

AU - Zhou, Yonghui

AU - Zhu, Ziming

AU - Yang, Zhaorong

AU - Xu, Xiaofeng

PY - 2022/8/1

Y1 - 2022/8/1

N2 - We report a succession of pressure-tuned structural transitions in the topological nodal-line superconductor PbTaSe2, evidenced from synchrotron x-ray diffraction, elastic neutron scattering, Raman spectroscopy, and electrical transport measurements up to 56 GPa, accompanied by first-principles calculations to uncover the evolution of the underlying electronic structure. In contrast to the previously proposed small shift of the Pb Wyckoff coordinate in the sub-GPa regime, our study reveals that it is rather a transition from P6¯m2 (α phase) to P63mc (β phase), subsequently followed by a transition to P6/mmm (γ phase) at ∼7.5 GPa and to Pmmm (δ phase) at ∼44 GPa. In addition, the first-principles calculations unambiguously demonstrate the multiple types of topological fermions associated with these different pressure-driven structures. Collectively, our results not only present the intriguing structural transitions in this topological PbTaSe2 superconductor, they also provide the impetus to study topological phase transitions and their physical consequences in a broader class of topological materials.

AB - We report a succession of pressure-tuned structural transitions in the topological nodal-line superconductor PbTaSe2, evidenced from synchrotron x-ray diffraction, elastic neutron scattering, Raman spectroscopy, and electrical transport measurements up to 56 GPa, accompanied by first-principles calculations to uncover the evolution of the underlying electronic structure. In contrast to the previously proposed small shift of the Pb Wyckoff coordinate in the sub-GPa regime, our study reveals that it is rather a transition from P6¯m2 (α phase) to P63mc (β phase), subsequently followed by a transition to P6/mmm (γ phase) at ∼7.5 GPa and to Pmmm (δ phase) at ∼44 GPa. In addition, the first-principles calculations unambiguously demonstrate the multiple types of topological fermions associated with these different pressure-driven structures. Collectively, our results not only present the intriguing structural transitions in this topological PbTaSe2 superconductor, they also provide the impetus to study topological phase transitions and their physical consequences in a broader class of topological materials.

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SN - 2469-9950

VL - 106

JO - Physical Review B

JF - Physical Review B

IS - 6

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ER -

Cascade of pressure-driven phase transitions in the topological nodal-line superconductor PbTaSe2

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