We performed ^63,65Cu NMR measurements of an electron-doped high-T_c cuprate superconductor T′-La_1.8Eu_0.2CuO_4−yF_y (0 ≤ y ≤ 0.125) having Nd₂CuO₄-type structure (so-called T′-structure). Pseudogap behavior is observed in the lightly electron-doped region of y ≤ 0.075. The nuclear spin–lattice relaxation rate 1/T₁ revealed that the antiferromagnetic spin fluctuations are suppressed by electron doping. These behaviors are like those reported in the optimum- and over-doped region of hole-doped high-T_c cuprate superconductors. It appears that electrons are more effectively doped through partial substitution in T′-La_1.8Eu_0.2CuO_4−yF_y than in isostructural T′-Pr_1.7−xLa_0.7Ce_xCuO₄.

中文翻译：

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通过63,65Cu NMR研究在T'-La1.8Eu0.2CuO4-yFy中电子掺杂抑制Pseeudogap行为和反铁磁涨落

我们进行^63,65的电子掺杂高的铜NMR测量Ť _Ç铜酸盐超导体T'-的La _1.8 Eu的_0.2的CuO _{4- Ý} ˚F _ý（0≤ Ý ≤0.125）具有的Nd ₂的CuO ₄型结构（所谓称为T'-结构）。赝行为在的轻电子掺杂区域中观察到ý ≤0.075。核自旋-晶格弛豫速率1 / T ₁表明，电子掺杂抑制了反铁磁自旋波动。这些行为类似于在空穴掺杂高T的最佳和超掺杂区域中报道的行为。_c铜酸盐超导体。看来，电子通过在T'-的La部分置换更有效地掺杂_1.8 Eu的_0.2的CuO _{4- ý} ˚F _ý比在同构T'-PR _{1.7- X}的La _0.7 Ce的_X的CuO ₄。