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首页> 外文期刊>Physical review >Interfacial electronic and magnetic properties of a Y_(0.6)Pr_(0.4)Ba_2Cu_3O_7/La_(2/3)Ca_(1/3)MnO_3 superlattice
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Interfacial electronic and magnetic properties of a Y_(0.6)Pr_(0.4)Ba_2Cu_3O_7/La_(2/3)Ca_(1/3)MnO_3 superlattice

机译:Y_(0.6)Pr_(0.4)Ba_2Cu_3O_7 / La_(2/3)Ca_(1/3)MnO_3超晶格的界面电子和磁性

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摘要

Resonant soft x-ray absorption spectroscopy and diffuse neutron scattering were used to study the interfacial properties of Y_(0.6)Pr_(0.4)Ba_2Cu_3O_7/La_(2/3)Ca_(1/3)MnO_3 superlattices. Dramatic changes from the bulk in the spectral line shape, energy position, and linear-polarization dependence of the Cu L_3-edge reveal a striking interfacial modification. The similarities to the case without Pr substitution confirm the strongly hybridized covalent Cu-O-Mn bond as the underlying driving mechanism. On the other hand, relative differences, including reduced charge transfer and interfacial orbital reconstruction, are observed and attributed to raising of the Fermi level of the cuprate layer with Pr substitution. Neutron reflectometry reveals an oscillatory behavior in the rapidly increasing diffuse scattering with decreasing temperature. Temperature- and field-dependent measurements indicate that the origin is associated with the buckling caused by the structural phase transition of the SrTiOj substrate rather than the superconducting or magnetic transition.
机译:利用共振软X射线吸收光谱和中子散射研究了Y_(0.6)Pr_(0.4)Ba_2Cu_3O_7 / La_(2/3)Ca_(1/3)MnO_3超晶格的界面性质。 Cu L_3边缘在光谱线形状,能量位置和线性极化依赖性方面的体积发生了巨大变化,显示出惊人的界面修饰。与没有Pr取代的情况相似,证实了强杂交的共价Cu-O-Mn键是潜在的驱动机制。另一方面,观察到相对差异,包括减少的电荷转移和界面轨道重构,并且归因于用Pr取代提高了铜酸盐层的费米能级。中子反射法揭示了随着温度降低,扩散散射迅速增加的振荡行为。取决于温度和场的测量结果表明,起因与SrTiOj衬底的结构相变而不是超导或磁转变引起的屈曲有关。

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