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

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 A1g, B1g, and B2g symmetries which show three distinct doping dependencies. Above p=0.22, the three energ...

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Bibliographic Details
Published in:Physical review. B 2015-10, Vol.92 (13), Article 134502
Main Authors: Benhabib, S., Gallais, Y., Cazayous, M., Méasson, M.-A., Zhong, R. D., Schneeloch, J., Forget, A., Gu, G. D., Colson, D., Sacuto, A.
Format: Article
Language:English
Subjects:
Condensed matter
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Constants
COPPER OXIDE
Crystals
Cuprates
CUPROUS OXIDE
Doping
ELECTRONIC PRODUCTS
Electronics
HOLES
Physics
Raman scattering
SCATTERING
SUPERCONDUCTIVITY
SUPERCONDUCTORS
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Summary: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 A1g, B1g, and B2g symmetries which show three distinct doping dependencies. Above p=0.22, the three energies merge; below p=0.12, the A1g scale is no longer detectable, while the B1g and B2g scales become constant in energy. In between, the A1g and B1g scales increase monotonically with underdoping, while the B2g 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.
ISSN:1098-0121
2469-9950
1550-235X
2469-9969
DOI:10.1103/PhysRevB.92.134502