Is Nd2-xCexCuO4 a high-temperature superconductor?

Single-crystalline N${\mathrm{d}}_{1.84}$C${\mathrm{e}}_{0.16}$Cu${\mathrm{O}}_{4}$ with a superconducting transition temperature of 19.3 K has been studied above and below ${T}_{c}$ using polarized Raman scattering. Electronic, crystal-field, and vibrational excitations have been detected. In the superconducting state, the formation of an almost isotropic gap $2\ensuremath{\Delta}$ is observed which varies between 4.1 and 4.9 in units of ${\mathrm{kT}}_{c}$. This indicates that N${\mathrm{d}}_{1.84}$C${\mathrm{e}}_{0.16}$Cu${\mathrm{O}}_{4}$ is different from the other cuprate systems.