Particle–hole asymmetric superconducting coherence peaks in overdoped cuprates

Zou, Changwei; Hao, Zhenqi; Luo, Xiangyu; Ye, Shusen; Gao, Qiang; Xu, Miao; Li, Xintong; Cai, Peng; Lin, Chengtian; Zhou, Xingjiang; Lee, Dung-Hai; Wang, Yayu

doi:10.1038/s41567-022-01534-x

Particle–hole asymmetric superconducting coherence peaks in overdoped cuprates

Journal Article · Mon Mar 21 00:00:00 EDT 2022 · Nature Physics

DOI:https://doi.org/10.1038/s41567-022-01534-x· OSTI ID:1906829

Zou, Changwei ^[1]; Hao, Zhenqi ^[1]; Luo, Xiangyu ^[2]; Ye, Shusen ^[1]; Gao, Qiang ^[2]; Xu, Miao ^[1]; ^[1]; ^[3]; Lin, Chengtian ^[4]; Zhou, Xingjiang ^[2]; ^[5]; ^[6]

Tsinghua Univ., Beijing (China)
Chinese Academy of Sciences (CAS), Beijing (China)
Renmin Univ. of China, Beijing (China)
Max Planck Institute of Solid State Research, Stuttgart (Germany)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Tsinghua Univ., Beijing (China); Frontier Science Center for Quantum Information, Beijing (China)

As doping increases in cuprate superconductors, the superconducting transition temperature increases to a maximum at the so-called optimal doping, and then decreases in the overdoped regime. In the past few decades, research has primarily focused on the underdoped and optimally doped regions of the phase diagram. Here, phenomena such as the pseudogap and strange metal non-superconducting states make it difficult to determine the superconducting pairing mechanism. More recently, experiments have shown unconventional behaviour in strongly overdoped cuprates, in both the normal and superconducting states. However, a real-space investigation of the unconventional superconductivity in the absence of the pseudogap is lacking, and the superconductor-to-metal phase transition in the overdoped regime remains controversial. Here we use scanning tunnelling microscopy to investigate the atomic-scale electronic structure of overdoped Bi₂Sr₂Ca_n–1Cu_nO_{2n + 4 + δ} cuprates. We show that, at low energies, the spectroscopic maps are well described by dispersive d-wave quasiparticle interference patterns. However, as the bias increases to the superconducting coherence peak energy, a periodic and non-dispersive pattern emerges. The position of the coherence peaks exhibits particle–hole asymmetry that modulates with the same period. Finally, we propose that this behaviour is due to quasiparticle interference caused by pair-breaking scattering between flat antinodal Bogoliubov bands.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: Beijing Advanced Innovation Center for Future Chip (ICFC); Chinese Academy of Sciences (CAS); Gordon and Betty Moore Foundation; Ministry of Science and Technology, China (MOST); National Natural Science Foundation of China (NSFC); Tencent Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1906829

Journal Information:: Nature Physics, Journal Name: Nature Physics Journal Issue: 5 Vol. 18; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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