Observation of Cu-NQR Spectrum over Whole Range of x in Y 1- xPr xBa 2Cu 3O 7- y
Observation of Cu-NQR Spectrum over Whole Range of x in Y 1- xPr xBa 2Cu 3O 7- y
复制标题
Y 1- xPr xBa 2Cu 3O 7- y 中 x 整个范围内的 Cu-NQR 谱观察
DOI：
10.1143/jpsj.68.748
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发表时间：
1999
影响因子：
1.7
通讯作者：
H. Yamagata
中科院分区：
文献类型：
--
作者：
M. Matsumura;M. Horiike;T. Yokoyama;H. Yamagata
在Y1-xPrxBa2Cu3O7-y的顺磁状态下，观察到了整个x范围内的CuNQR谱。铜(2)位和铜(1)位的nqr频率νnqr均不随x的增加而显著变化。这些结果与YBa2Cu3Ox和La2-xSrxCuO4在金属-绝缘体转变处的ν核磁共振的变化形成了鲜明的对比。这表明，即使在PrBa2Cu3O7中，YBa2Cu3O7中的掺杂空穴仍然留在CuO2面上，这与PrBa2Cu3O7中抑制超导电性的空穴填充机制相冲突。由于我们在PrBa2Cu3O7中的核磁共振谱不同于以前的报道，我们重新考虑了反铁磁有序态的ν谱。
The Cu NQR spectra were observed over the whole range of x in the paramagnetic state of Y 1- x Pr x Ba 2 Cu 3 O 7- y . The NQR frequencies, ν NQR , for both the Cu(2) and Cu(1) sites do not change significantly with increasing x . These results are in marked contrast to the variation of ν NQR at the metal-insulator transition in YBa 2 Cu 3 O x and La 2- x Sr x CuO 4 . This suggests that the doped holes in YBa 2 Cu 3 O 7 still remain in the CuO 2 plane even in PrBa 2 Cu 3 O 7 , which conflicts with the hole-filling mechanism for the suppression of the superconductivity in PrBa 2 Cu 3 O 7 . Since our value of ν NQR in PrBa 2 Cu 3 O 7 is different from that presented in the previous report, the NMR spectrum in the antiferromagnetic ordered state was reconsidered.