Suppression of antiferromagnetic order in the electron-doped cuprate T′-La2-xCexCuO4±δ

We performed systematic angle-resolved photoemission spectroscopy measurements in situ on T'La2-xCexCuO4 +/-delta (LCCO) thin films over the extended doping range prepared by the refined ozone/vacuum annealing method. Electron doping level (n), estimated from the measured Fermi surface (FS) volume, varied from 0.05 to 0.23, fully encompassing the superconducting dome. We observed an absence of the insulating behavior around n similar to 0.05 and the shift of FS reconstruction to n similar to 0.11 in LCCO from n similar to 0.15 in other electron-doped cuprates, suggesting that the antiferromagnetic order is strongly suppressed in this material. The possible explanation may lie in the enhanced next-nearest-neighbor hopping in LCCO because of the largest La3+ ionic radius among all the lanthanide elements.

Automated summary

Systematic angle-resolved photoemission spectroscopy measurements on T'La2-xCexCuO4+/-delta (LCCO) thin films revealed a variation in electron doping levels, affecting the Fermi surface volume and suppressing antiferromagnetic order in LCCO. This suppression may be attributed to enhanced next-nearest-neighbor hopping in LCCO due to the largest La3+ ionic radius among lanthanide elements.