Journal
PHYSICAL REVIEW B
Volume 67, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.67.184522
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Polarized electronic Raman scattering from the Nd1.85Ce0.15CuO4, superconductor at optimal electron doping (T-c = 22 K) reveals the formation of an anisotropic pseudogap below a characteristic temperature T* approximate to 220 K and energy E-g* = 850 cm(-1). Below T* a pronounced suppression of the incoherent spectral weight below E-g* = 850 cm(-1) 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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