Anisotropy, disorder, and commensurability in superconducting networks
| Autor: | M.A. Itzler, C.W. Wilks, Paul Chaikin |
|---|---|
| Rok vydání: | 1990 |
| Předmět: |
Superconductivity
Physics Resistive touchscreen Phase boundary Condensed matter physics Superconducting wire engineering.material Condensed Matter Physics Square lattice Electronic Optical and Magnetic Materials Tight binding engineering Electrical and Electronic Engineering Anisotropy Critical field |
| Zdroj: | Physica B: Condensed Matter. :1637-1638 |
| ISSN: | 0921-4526 |
| Popis: | We report on recent experiments on electron beam lithographically prepared superconducting wire networks. In square networks we have found that along with the dips in the T c vs. φ/φ 0 phase boundary at rational fields, there is an even more pronounced effect of rationality on the width of the resistive transition. We have disordered several types of networks, fit the phase boundary excellently with the J 2 model and shown that there is no critical field or amount of disorder above which the phase boundary loses periodic structure. We have introduced anisotropy into the square lattice by varying the thickness of the horizontal and vertical wires. This produces an anisotropic “phase boundary”, dependent on the direction inn which the anisotropy is probed, that is in good agreement with calculations for anisotropic tight binding bands in a strong field. We have found a unique way to disorder a quasi-crystalline network and used it to demonstrate that commensurate states are directly related to the inflation properties of the network. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|