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Evidence for impurity-induced frustration in La_2CuO_4

机译：La_2CuO_4中杂质引起的失意的证据

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摘要

Zero-field muon spin rotation and magnetization measurements were performed in La_2Cu_(1-X)M_XO_4, for 0≤ x≤ 0.12, where Cu~(2+) is replaced either by M = Zn~(2+) or by M = Mg~(2+) spinless impurity. It is shown that while the doping dependence of the sublattice magnetization [M(x)] is nearly the same for both compounds, the Neel temperature [T_N(x)] decreases unambiguously more rapidly in the Zn-doped compound. This difference, not taken into account within a simple dilution model, is associated with the frustration induced by the Zn~(2+) impurity onto the Cu~(2+) antiferromagnetic lattice. In fact, from T_N(x) and M(x) the spin stiffness is derived and found to be reduced by Zn doping more significantly than expected within a dilution model. The effect of the structural modifications induced by doping on the exchange coupling is also discussed.
机译：在La_2Cu_（1-X）M_XO_4中对0≤x≤0.12进行了零场μ子自旋旋转和磁化强度测量，其中Cu〜（2+）替换为M = Zn〜（2+）或替换为M = Mg〜（2+）无旋转杂质。结果表明，虽然两种化合物的亚晶格磁化强度[M（x）]的掺杂依赖性几乎相同，但是在掺锌的化合物中，尼尔温度[T_N（x）]的下降速度更快。在简单的稀释模型中未考虑到的这种差异与Zn〜（2+）杂质在Cu〜（2+）反铁磁晶格上引起的受挫有关。实际上，从T_N（x）和M（x）可以得出自旋刚度，并发现锌掺杂降低的自旋刚度比稀释模型中的预期要明显得多。还讨论了掺杂引起的结构修饰对交换耦合的影响。

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