Electronic State and Dissipation of Dynamic Vortex in Iron-Based Superconductor

Details Electronic State and Dissipation of Dynamic Vortex in Iron-Based Superconductor Electronic State and Dissipation of Dynamic Vortex in Iron-Based Superconductor

2011-10-30

arxiv.org/abs/1110.6575v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

The electronic state inside the vortex core and the energy dissipation induced by moving vortices in iron-based superconductor were investigated for the first time by the microwave-surface impedance measurement under finite magnetic fields, $B$. The flux-flow resistivity of the LiFeAs single crystal increases linearly with $B$, which is consistent with a nodeless gap in this material. However, the gradient is larger than that of Bardeen-Stephen theory at low $B$. This is the manifestation of the multiple-gap nature of LiFeAs. On our results, the vortex core of LiFeAs is found to be in the moderately clean regime. The estimated mean free path of the quasi-particle inside the vortex core is much shorter than that outside the core, and rather comparable to the core radius. We argue that a novel but a universal mechanism of dissipation, which has not yet been considered theoretically, exists in the moving vortex in superconductors.

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