Particle–hole asymmetric superconducting coherence peaks in overdoped cuprates
- 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 Bi2Sr2Can–1CunO2n + 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.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Natural Science Foundation of China (NSFC); Ministry of Science and Technology, China (MOST); Chinese Academy of Sciences (CAS); Gordon and Betty Moore Foundation; Beijing Advanced Innovation Center for Future Chip (ICFC); Tencent Foundation
- Grant/Contract Number:
- AC02-05CH11231; 51788104; 2017YFA0302900; 2016YFA0300300; 11888101; 11534007; XDB25000000; GBMF4545
- OSTI ID:
- 1906829
- Journal Information:
- Nature Physics, Vol. 18, Issue 5; ISSN 1745-2473
- Publisher:
- Nature Publishing Group (NPG)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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