2011/10/31 by T. Okada, Tatsunori Okada, Hidekazu Takahashi +10 · 1 citation
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Anisotropy #Condensed matter physics #Corporate Taxation and Avoidance #Dissipation #Iron-based superconductor #Iron-based superconductors research #Magnetic field #Magnetic flux #Materials science #Mechanics #Optics #Physics #Scattering #Superconductivity #Superconductivity in MgB2 and Alloys #Vortex #Vortex state #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.86.064516
published as Phys. Rev. B 86, 064516 (2012) · 5 pages, 4 figures
arxiv created 2012/06/15 · openalex publication_date 2012/08/14 · arxiv updated 2012/08/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
LiFeAs is one of the iron-based superconductors that has multiple gaps with a possible sign reversal. To clarify how those characteristics affect the energy dissipation of magnetic vortices, we investigated the microwave surface impedance of LiFeAs single crystals under finite magnetic fields. The flux-flow resistivity enhanced rapidly at low magnetic fields, which is similar to the case of MgB2. This is probably a consequence of the multiple-gap nature and the gap anisotropy. This suggest that the sign reversal is not important for the flux flow, even for multiple-gap superconductors. As for the electronic state, the vortex core of LiFeAs turned out to be ``moderately clean.'' Furthermore, the mean free path inside the vortex core was much shorter than that outside, and was close to the core radius. These results strongly suggest that a process specific to the core boundary is important for a scattering mechanism inside the vortex core.