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Fujita, K.; Drozdov, I.; Du, Z.; Li, H.; Joo, S.-H.; Lee, J.; Gu, G.; Johnson, P. D.; Valla, T.
Physical review. B, 01/2020, Volume: 101, Issue: 4Journal Article
A comparative study of the gaps measured in two techniques, angle-resolved photoelectron spectroscopy and spectroscopic imaging scanning tunneling microscopy, is presented. In particular the study focuses on the more overdoped region of the cuprate phase diagram in the superconducting state. While the total densities of states measured in the two techniques agree very well, it is shown that the peak in the density of states, ΔDOS, is consistently displaced to higher energies relative to the maximal superconducting gap, Δ0, determined in photoemission. The difference between the two gaps is more evident for the less doped samples reflecting increased normalization of bands. This observation will clearly influence the boundaries in the phase diagrams of the cuprates defined by these two techniques.
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