Mass-renormalized electronic excitations at ($π$, 0) in the superconducting state of $Bi_{2}Sr_{2}CaCu_{2}O_{8+δ}$

Details Mass-renormalized electronic excitations at ($π$, 0) in the superconducting state of $Bi_{2}Sr_{2}CaCu_{2}O_{8+δ}$ Mass-renormalized electronic excitations at ($π$, 0) in the superconducting state of $Bi_{2}Sr_{2}CaCu_{2}O_{8+δ}$

2002-02-19

arxiv.org/abs/cond-mat/0202329v2

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.68.174520

Using high-resolution angle-resolved photoemission spectroscopy on $Bi_{2}Sr_{2}CaCu_{2}O_{8+\delta}$, we have made the first observation of a mass renormalization or "kink" in the E vs. $\vec k$ dispersion relation localized near $(\pi, 0)$. Compared to the kink observed along the nodal direction, this new effect is clearly stronger, appears at a lower energy near 40 meV, and is only present in the superconducting state. The kink energy scale defines a cutoff below which well-defined quasiparticle excitations occur. This effect is likely due to coupling to a bosonic excitation, with the most plausible candidate being the magnetic resonance mode observed in inelastic neutron scattering.

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