STM/STS study on electronic superstructures in the superconducting state of high-Tc cuprate Bi2Sr2CaCu2O8+δ
Abstract
We report STM/STS measurements at 8 K in underdoped Bi2Sr2CaCu2O8+δ crystals (T c = 76 K and hole-doping level p ∼ 0.12) whose energy spectra around the Fermi level are characterized by a two-gap structure consisting of spatially inhomogeneous pseudogap (PG) and comparatively homogeneous superconducting gap (SCG). Two electronic superstructures, checkerboard modulation (CBM) and Cu-O-Cu bond-centered modulation (BCM), are observed with mapping spectral weights at low energies within the SCG and the ratio of spectral weights at ±ΔPG (PG energy), respectively. On the basis of the present findings, we suggest that the lower-energy scale CBM is an intrinsic property of Cu-O planes and can coexist with the BCM whose characteristic energy is ∼ΔPG in identical regions in real space.
- Publication:
-
Journal of Physics Conference Series
- Pub Date:
- March 2018
- DOI:
- 10.1088/1742-6596/969/1/012071
- Bibcode:
- 2018JPhCS.969a2071M