Microwave-stimulated superconductivity due to presence of vortices
Entity
UAM. Departamento de Física de la Materia CondensadaPublisher
Nature Publishing GroupDate
2015-03-17Citation
10.1038/srep09187
Scientific Reports 5 (2015): 9187
ISSN
2045-2322DOI
10.1038/srep09187Funded by
This 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.-FNRSProject
Gobierno de España. MAT2012-32743; Comunidad de Madrid. S2013/MIT-2850/NANOFRONTMAG-CMEditor's Version
http://dx.doi.org/10.1038/srep09187Subjects
Superconducting devices; Electromagnetic radiation; Superconductivity; Vortex; Magnetic field; FísicaAbstract
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
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Google Scholar:Lara, Antonio
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Aliev Kazanski, Farkhad
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Silhanek, Alejandro V.
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Moshchalkov, Victor V.
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