Continuous doping of a cuprate surface: Insights from in situ angle-resolved photoemission

We report a technique of a continuously doped surface of Bi2Sr2CaCu2O8+x through ozone/vacuum annealing and a systematic measurement over the nearly whole superconducting dome on the same sample surface by in situ angle-resolved photoemission spectroscopy. We find that the quasiparticle weight on th...

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Bibliographic Details
Published in:Physical review. B 2018-10, Vol.98 (14), p.140507(R), Article 140507
Main Authors: Zhong, Y.-G., Guan, J.-Y., Shi, X., Zhao, J., Rao, Z.-C., Tang, C.-Y., Liu, H.-J., Weng, Z. Y., Wang, Z. Q., Gu, G. D., Qian, T., Sun, Y.-J., Ding, H.
Format: Article
Language:English
Subjects:
Bismuth strontium calcium copper oxide
Carrier density
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Domes
Energy gap
Photoelectric emission
Superconductivity
Vacuum annealing
Weight
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Summary:We report a technique of a continuously doped surface of Bi2Sr2CaCu2O8+x through ozone/vacuum annealing and a systematic measurement over the nearly whole superconducting dome on the same sample surface by in situ angle-resolved photoemission spectroscopy. We find that the quasiparticle weight on the antinode is proportional to the doped carrier concentration x within the entire superconducting dome, while the nodal quasiparticle weight changes more mildly. More significantly, we discover that a d-wave pairing energy gap extracted from the nodal region scales well with the onset temperature of the Nernst signal. These findings suggest that the emergence of superconducting pairing is concomitant with the onset of free vortices.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.98.140507