Large momentum-dependence of the main dispersion ‘kink’ in the high-Tc superconductor Bi2Sr2CaCu2O8+δ

Large momentum-dependence of the main dispersion ‘kink’ in the high-Tc superconductor Bi2Sr2CaCu2O8+δ

Ultrahigh resolution angle-resolved photoemission spectroscopy with low-energy photons is used to study the detailed momentum dependence of the well-known nodal ‘kink’ dispersion anomaly of Bi _2 Sr _2 CaCu _2 O _8+ _δ . We find that the kink's location transitions smoothly from a maximum bindi...

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Bibliographic Details
Main Authors: N C Plumb, T J Reber, H Iwasawa, Y Cao, M Arita, K Shimada, H Namatame, M Taniguchi, Y Yoshida, H Eisaki, Y Aiura, D S Dessau
Format: Article
Language:English
Published: IOP Publishing 2013-01-01
Series:New Journal of Physics
Online Access:https://doi.org/10.1088/1367-2630/15/11/113004
Description
Summary:Ultrahigh resolution angle-resolved photoemission spectroscopy with low-energy photons is used to study the detailed momentum dependence of the well-known nodal ‘kink’ dispersion anomaly of Bi _2 Sr _2 CaCu _2 O _8+ _δ . We find that the kink's location transitions smoothly from a maximum binding energy of about 65 meV at the node of the d -wave superconducting gap to 55 meV roughly one-third of the way to the antinode. Meanwhile, the self-energy spectrum corresponding to the kink dramatically sharpens and intensifies beyond a critical point in momentum space. We discuss the possible bosonic spectrum in energy and momentum space that can couple to the k -space dispersion of the electronic kinks.
ISSN:1367-2630

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