我们研究了室温下系列Sr掺杂的Y(Ba1-xSrx)2Cu3O7-δ陶瓷样品的63,65Cu核四极共振谱.在YBa2Cu3O7-δ(Y123)中Sr2+的替代会在体系中产生化学压强效应,这种化学压强导致了CuO2平面的Cu(2)核四极共振信号向高频移动,而CuOx链层的Cu(1)核四极共振信号向低频移动.随着Sr2+掺杂的增加,Cu(2)和Cu(1)的核四极共振峰的峰宽都明显地变宽,同时还观察到一个新的Cu核四极共振峰.最后,我们给出了化学压强对超导转变温度的抑制的一些讨论,认为它与CuOx链层氧原子的部分无序导致的载流子非均匀分布或局域化有关.
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