Low-energy excitations around (π/2, π/2) points in the pseudogap phase of Nd_1.85Ce_0.15CuO_4

Details Low-energy excitations around (π/2, π/2) points in the pseudogap phase of Nd_1.85Ce_0.15CuO_4 Low-energy excitations around (π/2, π/2) points in the pseudogap phase of Nd_1.85Ce_0.15CuO_4

2003-04-08

arxiv.org/abs/cond-mat/0304175v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figs

Scientific paper

10.1103/PhysRevB.67.184522

Polarized electronic Raman scattering from the NCCO superconductor at optimal electron doping (T_c=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 (\pi/2, \pi/2) points that do not contribute to the optical conductivity.

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