Doping and temperature dependence of the mass enhancement observed in the cuprate Bi(2)Sr(2)CaCu(2)O(8+delta).
High-resolution photoemission is used to study the electronic structure of the cuprate superconductor, Bi(2)Sr(2)CaCu(2)O(8+delta), as a function of hole doping and temperature. A kink observed in the band dispersion in the nodal line in the superconducting state is associated with coupling to a resonant mode observed in neutron scattering. From the measured real part of the self-energy it is possible to extract a coupling constant which is largest in the underdoped regime, then decreasing continuously into the overdoped regime.
Johnson
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Department of Physics, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
Valla
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Fedorov
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Yusof
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Wells
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Li
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Moodenbaugh
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Gu
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Koshizuka
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Kendziora
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Jian
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Hinks
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