Imaging anisotropic vortex dynamics in FeSe

Abstract

Strong vortex pinning in FeSe could be useful for technological applications and could provide clues about the coexistence of superconductivity and nematicity. To characterize the pinning of individual, isolated vortices, we simultaneously apply a local magnetic field and image the vortex motion with scanning SQUID susceptibility. We find that the pinning is highly anisotropic: the vortices move easily along directions that are parallel to the orientations of twin domain walls and pin strongly in a perpendicular direction. These results are consistent with a scenario in which the anisotropy arises from vortex pinning on domain walls and quantify the dynamics of individual vortex pinning in FeSe.

arXiv comment7 pages, 7 figures

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• Imaging pinning and expulsion of individual superconducting vortices in amorphous MoSi thin films
• Local observation of linear-$T$ superfluid density and anomalous vortex dynamics in URu${}_2$Si${}_2$
• Oscillating paramagnetic Meissner effect and Berezinskii-Kosterlitz-Thouless transition in $B{i}_{2}S{r}_{2}CaC{u}_2{O}_{8+\delta }$ monolayer
• Mapping the intrinsic photocurrent streamlines through micromagnetic heterostructure devices
• Flux focusing with a superconducting nano-needle for scanning SQUID susceptometry
• Vortex dynamics induced by scanning SQUID susceptometry
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• Fractional vortex array realized at twin boundary in a nematic superconductor