Vibration effect on magnetization and critical current density of superconductors
| Autor: | Igor A. Golovchanskiy, Anatoly Rozenfeld, Sergey A. Fedoseev, Frederick S. Wells, Jonathan George, Alexey V. Pan |
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| Rok vydání: | 2016 |
| Předmět: |
Physics
Superconductivity Condensed matter physics Magnetometer Relaxation (NMR) Metals and Alloys 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Vortex law.invention Magnetic field Vibration Magnetization Amplitude law Condensed Matter::Superconductivity 0103 physical sciences Materials Chemistry Ceramics and Composites Physics::Chemical Physics Electrical and Electronic Engineering 010306 general physics 0210 nano-technology |
| Zdroj: | Superconductor Science and Technology. 29:075002 |
| ISSN: | 1361-6668 0953-2048 |
| Popis: | In this work the effect of vibrations on critical current density (J c ) of superconductors has been studied. The vibrations are shown to affect J c of all types of superconductors during their measurements, employing a vibrating sample magnetometer (VSM). Increasing vibration frequency (f) and/or amplitude (A) leads to progressive reduction of J c as a function of magnetic field (B a ). The effect of vibrations is substantially stronger in thin films. It leads to development of unexpected kinks on curves. Analysis of magnetization loops and relaxation of magnetization in YBCO films revealed that the vibration effect can be treated as the effective reduction of pinning potential. The asymmetry of the vibration effect in ascending and descending B a is observed, indicating differences in free energy of the corresponding vortex structures. Thermal effects induced by vibrations with large f and A are shown to have rather insignificant influence, while the vibrational vortex dynamics exhibit a strong impact. The irreversibility field () is shown to be instrumentally defined, and its value depends on VSM settings. In addition, the practical importance of for J c modeling is demonstrated. |
| Databáze: | OpenAIRE |
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