Terahertz magnetotransport measurements in underdopedPr2−xCexCuO4and comparison with angle-resolved photoemission

摘要: We present magnetotransport measurements performed on underdoped ${\text{Pr}}_{2\ensuremath{-}x}{\text{Ce}}_{x}{\text{CuO}}_{4}$ at THz frequencies as a function of temperature and doping. A rapidly decreasing Hall mass is observed the doping reduced consistent with formation small electron Fermi pockets. However, both dc infrared data strongly deviate from predictions transport theory within relaxation-time approximation based angular-resolved photoemission data. Furthermore, remains negative no signature change in Fermi-surface topology or above N\'eel characteristic which optical gap fully closes. In paramagnetic state, this behavior may be qualitatively understood arising current vertex corrections to conductivity due magnetic fluctuations overdoped [G. S. Jenkins et al., arXiv:0901.1701 (unpublished)].