Three energy scales in the superconducting state of hole-doped cuprates detected by electronic Raman scattering

Article

关键词: FERMI-SURFACE;    DOPING DEPENDENCE;    ORDER-PARAMETER;    PSEUDOGAP;    COMPETITION;    GAPS;    FLUCTUATIONS;    EXCITATIONS;    DYNAMICS;    SYMMETRY;   

DOI  :  10.1103/PhysRevB.92.134502

来源: SCIE

【 摘 要 】

We explore by electronic Raman scattering the superconducting state of the Bi2Sr2CaCu2O8+delta (Bi-2212) crystal by performing a fine-tuned doping study. We find three distinct energy scales in A(1g), B-1g, and B-2g symmetries which show three distinct doping dependencies. Above p = 0.22, the three energies merge; below p = 0.12, the A(1g) scale is no longer detectable, while the B-1g and B-2g scales become constant in energy. In between, the A(1g) and B-1g scales increase monotonically with underdoping, while the B-2g one exhibits a maximum at p = 0.16. The three superconducting energy scales appear to be a universal feature of hole-doped cuprates. We propose that the nontrivial doping dependencies of the three scales originate from the Fermi-surface changes and reveal competing orders inside the superconducting dome.

【 授权许可】

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