论文标题
超导PR2BA4CU7O15-δ的CUO2平面绝缘和抗铁磁状态的核旋转证据
Nuclear-spin evidence of insulating and antiferromagnetic state of CuO2 planes in superconducting Pr2Ba4Cu7O15-δ
论文作者
论文摘要
与“ PR-ISSUE”相反，PRBA2CU3O7（PR123）和PRBA2CU4O8（PR124）都显示超导性（SC），我们观察到在氧还原的PR2BA4CU7O（15-DELTA）（PR247）（PR247）中，SC的100％分数（PR247）（PR2222224） + pr24 = PR247 = PR247 = PR247 = pr247 = pr247 = hybrid。发现在300K处观察到的CUO2平面的Cu核旋转信号完全以2K的速度删除。取而代之的是，在较高的频率下观察到2K处的平面信号。这表明，尽管有大量SC，但发现PR247中的CUO2平面仍处于绝缘和抗磁性有序状态。
In contrast to the "Pr-issue" that neither PrBa2Cu3O7 (Pr123) nor PrBa2Cu4O8 (Pr124) shows superconductivity (SC), we have observed 100%-fraction of SC in an oxygen-reduced Pr2Ba4Cu7O(15-delta) (Pr247) which has a hybrid structure that Pr247 = Pr123 + Pr124. It is found that Cu nuclear-spin signals from the CuO2 planes observed at 300K are completely wiped out down at 2K. Instead, plane signals at 2K are observed at higher frequencies. This indicates that, despite the bulk SC, the CuO2 planes in Pr247 are found to be in an insulating and antiferromagnetically ordered state.
