Bipartite electronic superstructures in the vortex core of Bi2Sr2CaCu2O8+δ
2016
The central issue in the physics of cuprate superconductivity is the mutual relationship among superconductivity,
pseudogapand broken-spatial-symmetry states. A magnetic field B suppresses superconductivity, providing an opportunity to investigate the competition among these states. Although various B-induced electronic
superstructureshave been reported, their energy, spatial and momentum-space structures are unclear. Here, we show using spectroscopic-imaging scanning tunnelling microscopy on Bi2Sr2CaCu2O8+δ that there are two distinct B-induced electronic
superstructures, both being localized in the vortex core but appearing at different energies. In the low-energy range where the nodal Bogoliubov
quasiparticlesare well-defined, we observe the so-called vortex
checkerboardthat we identify as the B-enhanced
quasiparticleinterference pattern. By contrast, in the high-energy region where the
pseudogapdevelops, the broken-spatial-symmetry patterns that pre-exist at B=0 T is locally enhanced in the vortex core. This evidences the competition between superconductivity and the broken-spatial-symmetry state that is associated with the
pseudogap.
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