Pseudogap behavior in T'-Pr_1.3-xLa_0.7Ce_xCuO₄ revealed by ^63,65Cu NMR

We performed ^63,65Cu NMR measurements of electron-doped high-T_c cuprate superconductor T'-Pr_1.3−xLa_0.7Ce_xCuO₄ with the Nd₂CuO₄-type structure (so-called T'-structure) for 0.00 ≤ x ≤ 0.15. Pseudogap behavior was observed in the lightly electron-doped region for x ≤ 0.10. The nuclear spin–lattice relaxation rate 1/T₁ also shows that the antiferromagnetic spin fluctuations are strongly enhanced for x ≤ 0.10. These behaviors in the normal state are similar to that reported for the hole-doped high-T_c cuprate superconductors. (author)