A review of some new perspectives on the theory of superconducting Sr2RuO4

doi:10.1088/1674-1056/ac2488

中国物理B ›› 2021, Vol. 30 ›› Issue (10): 107403-107403.doi: 10.1088/1674-1056/ac2488

所属专题： SPECIAL TOPIC — Unconventional superconductivity

A review of some new perspectives on the theory of superconducting Sr₂RuO₄

Wen Huang(黄文)^1,2,†

1 Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China;
2 Guangdong Provincial Key Laboratory of Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China

收稿日期:2021-08-12 修回日期:2021-08-12 接受日期:2021-09-08 发布日期:2021-10-08
通讯作者: Wen Huang E-mail:huangw3@sustech.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11904155), the Guangdong Provincial Key Laboratory (Grant No. 2019B121203002), and a Shenzhen Science and Technology Program (Grant No. KQTD20200820113010023).

A review of some new perspectives on the theory of superconducting Sr₂RuO₄

Wen Huang(黄文)^1,2,†

1 Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China;
2 Guangdong Provincial Key Laboratory of Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China

Received:2021-08-12 Revised:2021-08-12 Accepted:2021-09-08 Published:2021-10-08
Contact: Wen Huang E-mail:huangw3@sustech.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11904155), the Guangdong Provincial Key Laboratory (Grant No. 2019B121203002), and a Shenzhen Science and Technology Program (Grant No. KQTD20200820113010023).

摘要/Abstract

摘要： The nature of the Cooper pairing in the paradigmatic unconventional superconductor Sr₂RuO₄ is an outstanding puzzle in condensed matter physics. Despite the tremendous efforts made in the past twenty-seven years, neither the pairing symmetry nor the underlying pairing mechanism in this material has been understood with clear consensus. This is largely due to the lack of a superconducting order that is capable of interpreting in a coherent manner the numerous essential experimental observations. At this stage, it may be desirable to reexamine our existing theoretical descriptions of superconducting Sr₂RuO₄. This review focuses on several recent developments that may provide some clues for future study. We highlight three separate aspects: 1) any pairing in the E_u symmetry channel, with which the widely discussed chiral p-wave is associated, shall acquire a 3D structure due to spin-orbit entanglement; 2) if the reported Kerr effect is a superconductivity-induced intrinsic bulk response, the superconductivity must either exhibit a chiral character, or be complex mixtures of certain set of helical p-wave pairings; 3) when expressed in a multiorbital basis, the Cooper pairing could acquire numerous exotic forms that are inaccessible in single-orbital descriptions. The implications of each of these new perspectives are briefly discussed in connection with selected experimental phenomena.

关键词: Sr₂RuO₄, unconventional superconductivity, pairing symmetry, Kerr effect

Abstract: The nature of the Cooper pairing in the paradigmatic unconventional superconductor Sr₂RuO₄ is an outstanding puzzle in condensed matter physics. Despite the tremendous efforts made in the past twenty-seven years, neither the pairing symmetry nor the underlying pairing mechanism in this material has been understood with clear consensus. This is largely due to the lack of a superconducting order that is capable of interpreting in a coherent manner the numerous essential experimental observations. At this stage, it may be desirable to reexamine our existing theoretical descriptions of superconducting Sr₂RuO₄. This review focuses on several recent developments that may provide some clues for future study. We highlight three separate aspects: 1) any pairing in the E_u symmetry channel, with which the widely discussed chiral p-wave is associated, shall acquire a 3D structure due to spin-orbit entanglement; 2) if the reported Kerr effect is a superconductivity-induced intrinsic bulk response, the superconductivity must either exhibit a chiral character, or be complex mixtures of certain set of helical p-wave pairings; 3) when expressed in a multiorbital basis, the Cooper pairing could acquire numerous exotic forms that are inaccessible in single-orbital descriptions. The implications of each of these new perspectives are briefly discussed in connection with selected experimental phenomena.

Key words: Sr₂RuO₄, unconventional superconductivity, pairing symmetry, Kerr effect

中图分类号: (Pairing symmetries (other than s-wave))

74.20.Rp

74.20.-z (Theories and models of superconducting state) 74.70.Pq (Ruthenates) 74.25.F- (Transport properties)

Wen Huang(黄文). A review of some new perspectives on the theory of superconducting Sr₂RuO₄[J]. 中国物理B, 2021, 30(10): 107403-107403.

Wen Huang(黄文). A review of some new perspectives on the theory of superconducting Sr₂RuO₄[J]. Chin. Phys. B, 2021, 30(10): 107403-107403.

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A review of some new perspectives on the theory of superconducting Sr₂RuO₄

A review of some new perspectives on the theory of superconducting Sr₂RuO₄

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