Abstract
We investigate the spatial and doping evolutions of the superconducting properties of trilayer cuprate by using scanning tunneling microscopy and spectroscopy. Both the superconducting coherence peak and gap size exhibit periodic variations with structural supermodulation, but the effect is much more pronounced in the underdoped regime than at optimal doping. Moreover, a new type of tunneling spectrum characterized by two superconducting gaps emerges with increasing doping, and the two-gap features also correlate with the supermodulation. We propose that the interaction between the inequivalent outer and inner planes is responsible for these novel features that are unique to trilayer cuprates.
- Received 29 April 2019
- Revised 24 July 2019
DOI:https://doi.org/10.1103/PhysRevLett.124.047003
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