Suppression of Antiferromagnetic Order by Light Hole Doping in La_2Cu_{1-x}Li_xO_4: A ^{139}La NQR Study

摘要

^{139}La nuclear quadrupole resonance measurements in lightly dopedLa_2Cu_{1-x}Li_xO_4 have been performed to reveal the dependence of themagnetic properties of the antiferromagnetic CuO_2 planes on the character ofthe doped holes and their interactions with the dopant. A detailed study showsthat the magnetic properties are remarkably insensitive to the character of thedopant impurity. This indicates that the added holes form previouslyunrecognized collective structures.