arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1409.0678cond-mat.supr-con
收藏

多带电子掺杂铜氧化物超导中的赝能隙

The pseudogaps in multiband electron-doped cuprate superconductivity

N. Kristoffel, P. Rubin

摘要:

在多带超导框架下分析了赝能隙激发。对电子掺杂铜氧化物超导体的掺杂相图进行了计算。非刚性多带模型已被使用。带间配对的行为之间的哈伯德带(UHB)和midgap状态创建(和向上移动)的掺杂。提出了两个PG和两个相图临界点(CP)的出现。较大的反节PG反映了长程反铁磁(AF)秩序的破坏。第二个较小的PG是一个近节点事件,暴露的掺杂依赖性后面的第一个CP。它到达T $_c$圆顶。已经进行了模型计算。相图的特性是由掺杂激发带重叠动力学决定的。与通过掺杂引入的载流子相比,对外来载流子的观察预期从PG消失开始。

英文摘要:

The pseudogap (PG) excitations in the framework of multiband superconductivity are analysed. Calculations for the doping phase diagram of electron-doped cuprate superconductors have been made. A nonrigid multiband model has been used. The interband pairing acts between the upper Hubbard band (UHB) and midgap states created (and shifted upwards) by doping. The appearance of two PG and two phase diagram critical points (CP) is suggested. The larger antinodal PG reflects the destruction of the long-range antiferromagnetic (AF) order. The second, smaller PG is a near-nodal event with exposed doping dependence behind the first CP. It reaches the T$_c$ - dome. Model calculations have been made. The peculiarities of the phase diagram are determined by the doping-stimulated band overlap dynamics. The observation of ,,foreign`` carriers as compared to the ones introduced by doping is expected to start with the vanishing PG.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑