Oxygen diffusion and dynamical disorder in high-T c superconductors: low frequency noise in superconducting tunnel junctions |
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| Authors: | Robert I. Shekhter Alexandre M. Zagoskin Göran Wendin |
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| Affiliation: | (1) Department of Applied Physics, Chalmers University of Technology and University of Göteborg, S-41296 Göteborg, Sweden;(2) Institute of Theoretical Physics, Chalmers University of Technology, S-41296 Göteborg, Sweden;(3) Present address: Institute for Low Temperature Physics and Engineering, Ukrainian Acad. Sci., Lenin Ave. 47, 310164 Kharkov, Ukraine |
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| Abstract: | The equilibrium diffusion fluctuations of oxygen concentration in HTSC are considered as a possible source of the low frequency current/voltage noise in tunnel junctions near the transition temperature in the frames of the model independent phenomenological approach. The general expression for the noise spectrum,S( ), is obtained. It is shown that the noise is  diffusion-like ,S() –2, and it is proportional to the square of the contact current/voltage. The noise magnitude is sharply peaked near the maximal critical temperature achievable for a given type of HTSC by an optimal oxygen doping.The noise cutoff frequency, below which it can be observed on the thermal background, has the activation like temperature dependence and is estimated to be 1s–1.The other possible consequences of the oxygen concentration fluctuations in HTSC are discussed. |
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