Low-energy excitations around (π/2, π/2) points in the pseudogap phase of Nd1.85Ce0.15CuO4
Abstract
Polarized electronic Raman scattering from the NCCO superconductor at optimal electron doping (Tc=22 K) reveals the formation of an anisotropic pseudogap below a characteristic temperature T* ~ 220 K and energy E*g = 850 cm-1. Below T* a pronounced suppression of the incoherent spectral weight below E*g in the nodal directions of k-space is observed. This is concomitant with the emergence of long-lived excitations in the vicinity of the (π/2, π/2) points that do not contribute to the optical conductivity.
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