Paramagnetic Meissner Transitions in Pb Films and the Vortex Compression Model
| Autor: | G. Torricelli, S. J. Gurman, D. S. W. Gray, D. Brandt, Colin W. Binns |
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| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Journal of Low Temperature Physics. 163:170-175 |
| ISSN: | 1573-7357 0022-2291 |
| Popis: | The magnetic flux exclusion known as Meissner effect resulting from a perfectly diamagnetic susceptibility χ=−1 is one of the defining features of type-I superconductivity. More recently some materials have been reported to undergo a transition to a paramagnetic state as they are cooled through their superconducting transition temperature (Svedlindh et al. in Physica C, pp. 162–164, 1989; Li in Phys. Rep. 376:133–223, 2003). This is known as the Paramagnetic Meissner Effect (PME). Here we report the observation of a transition from the Meissner state to a PME state in thin Pb films. We go on to show how simple modifications to the vortex compression model developed by Koshelev and Larkin (Phys. Rev. B 52:13559–13562, 1995) yield magnetization-vs-temperature curves in good qualitative agreement with the magnetization curves reported in the experiment. |
| Databáze: | OpenAIRE |
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