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首页> 外文会议>Conference on High Temperature Superconductivity Coral Gables, Florida January 7-13 1999 >Influence of ionic dielectricity on the dynamic superconducting order parameter
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Influence of ionic dielectricity on the dynamic superconducting order parameter

机译：离子介电常数对动态超导阶跃参数的影响

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摘要

We investigate the effect of a ferroelectric transition that is close to a superconducting transition. The closeness of the ferroelectric transition manifests itself in a large ionic dielectric constant epsilon , which is not present in "normal" metals where the conduction electrons shield it out. This reduces the Debye screening parameter from qD to qD/ epsilon at frequencies below the dispersion frequency omega _t approx approx 20 meV of epsion ( omega ). The electron-phonon matrix element is renormalized as a result. We extend the Eliashberg equations for this renormalized interaction, and develop an algorithm to solve them along the real- omega axis. We find that various anomalous properties, such as the high value of T_c, the high value of 2 DELTA _0/T_c, the d-wave symmetry of the gap parameter, the extended Van-Hove singularity, the damping of the electronic states near the FS, the pseudogap, and various other properties of the cuprates, as well as organic metals, are accounted for.
机译：我们研究了接近超导转变的铁电转变的影响。铁电跃迁的紧密性表现为较大的离子介电常数ε，而在传导电子将其屏蔽的“正常”金属中则不存在。这样，在低于弥散频率ω_t的频率下，将德拜屏蔽参数从qD降低到qD /ε，大约为epsion（ω）约20 meV。结果，电子声子矩阵元素被重新归一化。我们为这种重新规范化的相互作用扩展了Eliashberg方程，并开发了沿实心轴求解它们的算法。我们发现各种异常性质，例如T_c的高值，2 DELTA _0 / T_c的高值，间隙参数的d波对称性，扩展的Van-Hove奇异性，电子态的阻尼FS，伪间隙以及铜酸盐以及有机金属的各种其他特性均得到考虑。

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