The crystalline electric field as a direct probe for the electron doping process in Nd"2"-"χCe"χCuO"4 - Furrer, A.; Allenspach, P.; Mesot, J.; Staub, U. (Elsevier)
The neutron spectroscopic data available for the cuprates Nd"2"-"χCe"χCuO"4 are analyzed towards establishing the crystalline electric field (CEF) interaction around the Nd^3^+ sites, which are situated close to the CuO"2 planes and thus constitute a local probe of the charge distribution in these planes. Through a comparison of the CEF parameters in the insulating (χ=0) and superconducting (χ=0.15) state we find direct evidence for the addition of electrons to the CuO"2 planes by doping Nd"2CuO"4 with Ce^4^+. While this compound is widely believed to be favourable for electron doping onto copper, our results indicate that the oxygen sites are also involved in the electron doping mechanism.
http://linkinghub.elsevier.com/retrieve/pii/0921-4534(90)90085-S
Keywords: U