1⧸ƒ noise power measurements on Tl2Ba2Can−1CunO4+2n (n = 2 and 3)
| Autor: | X. D. Chen, Antonio Querubin, Yi Song, James R. Gaines, P. P. Crooker, Yue Cao, Anupam K. Misra |
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| Rok vydání: | 1990 |
| Předmět: |
chemistry.chemical_classification
Superconductivity Noise power Materials science Condensed matter physics Noise spectral density Energy Engineering and Power Technology Condensed Matter Physics Electronic Optical and Magnetic Materials Quality (physics) chemistry Electrical resistivity and conductivity Grain boundary Electrical and Electronic Engineering Inorganic compound Noise (radio) |
| Zdroj: | Physica C: Superconductivity. 172:1-12 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/0921-4534(90)90636-s |
| Popis: | We have performed systematic 1⧸ƒ noise power measurements on bulk Tl 2 Ba 2 Ca n −1 Cu n O 4+2 n ( n = 2 and 3) materials normal and superconducting states. The 1⧸ƒ noise power is generally found to decrease with temperature until the superconducting transition region is approached. We observe no correlation between the magnitude of the 1⧸ƒ noise power in the normal state and the sample quality. In contrast to bulk Y 1 Ba 2 Cu 3 O 7− δ samples, the enhancement of the 1⧸ƒ noise in the superconducting transiti on region is reduced or even totally disappears in some of our good quality samples. We discuss a model calculation based on potential fluctuations in the grain boundary regions modeled as metal-insulator-metal junctions. We demonstrate that if direct knowledge of the barrier characteristics of the junctions is available, it is possible to explain our experimental data quantitstively. |
| Databáze: | OpenAIRE |
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