• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Conference on High Temperature Superconductivity Coral Gables, Florida January 7-13 1999 >MNR studies of the original magnetic properties of the cuprates: effect of impurities and defects
【24h】

MNR studies of the original magnetic properties of the cuprates: effect of impurities and defects

机译：MNR研究铜酸盐的原始磁性：杂质和缺陷的影响

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Substitutional impurities in the CuO_2 planes of the cuprates allow us to probe the electronic properties of the host material. The pseudo-gap in the underdoped regime is unmodifed far from the impurites even though T_c is greatly reduced. The spin polarisation induced by magnetic impurities has an osillatory behaviour reflecting the existing AF correlations between the Cu spins. Its influence on the NMR spectra opens a way to determine the q dependence of he static spin suscpetigbility and the T dependence of the AF correlation length. NMR measurements demonstrate that nonmagnetic impurities such as zn induce a local moment behaviour on the neighbouring Cu sites. This magnetism revealed by spin-less sites can be understood on theoretical grounds in the case of undoped quantum spin systems, while here the carriers greatly complicate the situation. Susceptibility data show that the magnitude of the local moment decreases with increasing hole doping. Htis experimental evidence directly reflects the influence of AF correlations and the interference between the carriers and the Cu hole spins in the cuprates. The anomalously large scattering of the carriers on spinless defects is another indication of the originality of the electronic properties of the cuprates, which apparently extends even to the overdoped regime.
机译：铜酸盐的CuO_2平面中的取代杂质使我们能够探究基质材料的电子性质。即使T_c大大降低，在掺杂不足的情况下，伪间隙也没有被修改，与杂质无关。磁性杂质引起的自旋极化具有振荡行为，反映了Cu自旋之间现有的AF相关性。它对NMR光谱的影响为确定静态自旋敏感性的q依赖性和AF相关长度的T依赖性开辟了一条途径。 NMR测量表明，诸如zn之类的非磁性杂质会在相邻的Cu位点上引起局部矩行为。在无掺杂量子自旋系统的情况下，可以从理论上理解无自旋位点揭示的这种磁性，而此处的载流子使情况更加复杂。磁化率数据表明，局部力矩的大小随空穴掺杂的增加而减小。这些实验证据直接反映了AF相关性的影响以及载体与铜酸盐中Cu孔自旋之间的干扰。载体在无旋转缺陷上的异常大的散射是铜酸盐电子性质独创性的另一种指示，显然它甚至延伸到超掺杂状态。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号