scholarly journals A Dielectric Approach to High Temperature Superconductivity

1989 ◽  
Vol 42 (5) ◽  
pp. 541 ◽  
Author(s):  
J Mahanty ◽  
MP Das
Keyword(s):  
High Temperature ◽  
Sound Velocity ◽  
Dielectric Function ◽  
Dielectric Response ◽  
High Temperature Superconductivity ◽  
Pair Formation

In this paper we investigate the dielectric response of an electron-ion system to the presence of a pair of charges. From the nature of the dielectric function, it Is shown that a strong attractive pair formation is possible depending on the dispersion of the ion branches. The latter brings a reduction to the sound velocity which is used as a criterion for the superconductivity. By solving the BCS equation with the above dielectric function, we obtain a reasonable value of Te.

scholarly journals Is There a Metamaterial Route to High Temperature Superconductivity?

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Igor I. Smolyaninov ◽  
Vera N. Smolyaninova
Keyword(s):  
High Temperature ◽  
Critical Temperature ◽  
Dielectric Response ◽  
High Temperature Superconductivity ◽  
Traditional Approach ◽  
Spatial Scales ◽  
Superconducting Transition ◽  
Superconducting Coherence Length ◽  
Electromagnetic Metamaterials ◽  
Electron Interactions

Superconducting properties of a material such as electron-electron interactions and the critical temperature of superconducting transition can be expressed via the effective dielectric response functionεeff(q,ω) of the material. Such a description is valid on the spatial scales below the superconducting coherence length (the size of the Cooper pair), which equals ∼100 nm in a typical BCS superconductor. Searching for natural materials exhibiting larger electron-electron interactions constitutes a traditional approach to high temperature superconductivity research. Here we point out that recently developed field of electromagnetic metamaterials deals with somewhat related task of dielectric response engineering on sub-100 nm scale. We argue that the metamaterial approach to dielectric response engineering may considerably increase the critical temperature of a composite superconductor-dielectric metamaterial.

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