Temperature evolution of correlation strength in the superconducting state of high-Tc cuprates

Abstract

We have performed an angle-resolved photoemission study of the nodal quasi-particle spectra of the high-Tc cuprate tri-layer Bi2Sr2Ca2Cu3O10+d (Tc~ 110 K). The spectral weight Z of the nodal quasi-particle increases with decreasing temperature across the Tc. Such a temperature dependence is qualitatively similar to that of the coherence peak intensity in the anti nodal region of various high-Tc cuprates although the nodal spectral weight remains finite and large above Tc. We attribute this observation to the reduction of electron correlation strength in going from the normal metallic state to the superconducting state, a characteristic behavior of a superconductor with strong electron correlation.

13 pages, 5 figures

References in corpus (14)

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• Coherent quasiparticle weight and its connection to high-T_c superconductivity from angle-resolved photoemission
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• The a-axis optical conductivity of detwinned ortho-II YBa_2Cu_3O_6.50
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• The Temperature Evolution of the Spectral Peak in High Temperature Superconductors
• Coherent quasi-particles-to-incoherent hole-carriers crossover in underdoped cuprates
• Optical Spectroscopy as a Probe of Gaps and Kinetic Electronic Energy in p- and n-type cuprates

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