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Low-energy excitations around<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo>(</mml:mo><mml:mi>π</mml:mi><mml:mo>/</mml:mo><mml:mn>2</mml:mn><mml:mo>,</mml:mo><mml:mi>π</mml:mi><mml:mo>/</mml:mo><mml:mn>2</mml:mn><mml:mo>)</mml:mo></mml:math>points in the pseudogap phase of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Nd</mml:mi></mml:mrow><mml:mrow><mml:mn>1.85</mml:mn></mml…
Polarized electronic Raman scattering from the ${\mathrm{Nd}}_{1.85}{\mathrm{Ce}}_{0.15}{\mathrm{CuO}}_{4},$ superconductor at optimal electron doping ${(T}_{c}=22\mathrm{K})$ reveals the formation of an anisotropic pseudogap below a characteristic temperature ${T}^{*}\ensuremath{\approx}220\mathrm{K}$ and energy ${E}_{g}^{*}=850{\mathrm{cm}}^{\ensuremath{-}1}.$ Below ${T}^{*}$ a pronounced suppression of the incoherent spectral weight below ${E}_{g}^{*}=850{\mathrm{cm}}^{\ensuremath{-}1}$ in the nodal directions of $\mathbf{k}$ space is observed. This …