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首页> 外文期刊>Physica, C. Superconductivity and its applications >Cu-63,Cu-65 nuclear quadrupole resonance study of Ni-doped YBa2Cu3O7
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Cu-63,Cu-65 nuclear quadrupole resonance study of Ni-doped YBa2Cu3O7

机译：掺Ni的YBa2Cu3O7的Cu-63，Cu-65核四极共振研究

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摘要

We have prepared pure YBCO (YBa2Cu3O7-delta) and Ni-doped YBCO (YBa2-xLaxCu3-xNixO7-delta, x = 0.1) samples and performed Cu-63,Cu-65 nuclear quadrupole resonance (NQR) measurements. La substitution introduced for charge compensation, as well as Ni doping, severely distorts the electric field gradient at the copper sites inducing extra Cu-63,Cu-65 NQR peaks other than the main peaks, for both the plane and the chain sites. Cu-63,Cu-65 NQR linewidths for the plane site increased significantly whereas those for the chain site remained similar. Furthermore, both the spin-lattice and the spin-spin relaxation times for the plane copper decreased whereas those for the chain copper increased. The Ni substitutional effects on linewidths and relaxation times confirm that Ni carrying a local moment substitutes for the plane copper. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 23]
机译：我们准备了纯YBCO（YBa2Cu3O7-delta）和镍掺杂YBCO（YBa2-xLaxCu3-xNixO7-delta，x = 0.1）样品，并进行了Cu-63，Cu-65核四极共振（NQR）测量。为电荷补偿以及镍掺杂引入的La置换严重扭曲了铜位点处的电场梯度，导致平面位点和链位点处都产生了除主峰以外的额外Cu-63，Cu-65 NQR峰。平面位点的Cu-63，Cu-65 NQR线宽显着增加，而链位点的线宽保持相似。此外，平面铜的自旋晶格和自旋自旋弛豫时间均减少，而链状铜的自旋晶格和自旋自旋弛豫时间均增加。 Ni对线宽和弛豫时间的替代作用证实了带有局部力矩的Ni替代了平面铜。 （C）2000 Elsevier Science B.V.保留所有权利。 [参考：23]

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