Microwave-stimulated superconductivity due to presence of vortices
EntityUAM. Departamento de Física de la Materia Condensada
PublisherNature Publishing Group
10.1038/srep09187Scientific Reports 5 (2015): 9187
Funded byThis work has been supported in parts by Spanish MINECO (MAT2012-32743), and Comunidad de Madrid (NANOFRONTMAG-CM S2013/MIT-2850) and NANO-SC COST-Action MP-1201. A. Lara thanks UAM for FPI-UAM fellowship. The work of A.V.S. was partially supported by Mandat ‘‘d’Impulsion Scientifique’’ of the F.R.S.-FNRS
ProjectGobierno de España. MAT2012-32743; Comunidad de Madrid. S2013/MIT-2850/NANOFRONTMAG-CM
SubjectsSuperconducting devices; Electromagnetic radiation; Superconductivity; Vortex; Magnetic field; Física
Esta obra está bajo una Licencia Creative Commons Atribución 4.0 Internacional.
The response of superconducting devices to electromagnetic radiation is a core concept implemented in diverse applications, ranging from the currently used voltage standard to single photon detectors in astronomy. Suprisingly, a sufficiently high power subgap radiation may stimulate superconductivity itself. The possibility of stimulating type II superconductors, in which the radiation may interact also with vortex cores, remains however unclear. Here we report on superconductivity enhanced by GHz radiation in type II superconducting Pb films in the presence of vortices. The stimulation effect is more clearly observed in the upper critical field and less pronounced in the critical temperature. The magnetic field dependence of the vortex related microwave losses in a film with periodic pinning reveals a reduced dissipation of mobile vortices in the stimulated regime due to a reduction of the core size. Results of numerical simulations support the validy of this conclusion. Our findings may have intriguing connections with holographic superconductors in which the possibility of stimulation is under current debate
Google Scholar:Lara, Antonio - Aliev Kazanski, Farkhad - Silhanek, Alejandro V. - Moshchalkov, Victor V.
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