Tham khảo tài liệu 'handbook of high temperature superconductor electronics part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 5 Conductance Noise in High-Temperature Superconductors László Béla Kish Texas A M University College Station Texas . INTRODUCTION High- Tc superconductor HTS materials have the potential to revolutionize low-noise electronics because superconductor electronics can be realized at relatively high temperatures. These temperatures might soon be achievable by solid-state cooling elements at the commercial level if both the HTS and the cooling element development continues at the current level. However it should be kept in mind that this task might not compromise the requirements of low-noise. The real condition of success of HTS materials will always be the potentially low level of noise because their high-speed semiconductor and nanoelectronics are strong competitors at convenient working temperatures. Due to the different physics of superconductors their potentially achievable noise properties seem to be unbeatable. However as far as HTS devices are concerned although their noise properties are good the same properties are achievable by semiconductor circuits also but the circuits need a carefully designed circuitry. Therefore understanding the source of noise and reducing the noise level in the HTS materials has a high priority in research. Although the details of the mechanism of noise generation in HTS materials is not fully understood it has been proven that percolation effects are the key Copyright 2003 by Marcel Dekker Inc. All Rights Reserved. to understanding the characteristic behavior of the noise in the conductor-superconductor temperature regime. The percolation models are superior also in the sense that they can predict the behavior of normalized noise in a very wide range with variations up to nine orders of magnitude. Such a success of a model to predict behavior can rarely be found in condensed matters physics. In the present survey we give a basic overview based on Refs. 1-3 of low-frequency f 105 Hz conductance noise in the .
