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Observation of vortex coalescence in the anisotropic spin-triplet superconductor Sr$_{2}$RuO$_{4}$

V. O. Dolocan·C. Veauvy·Y. Liu·F. Servant·P. Lejay·D. Mailly·K. Hasselbach
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Abstract

We present direct imaging of magnetic flux structures in the anisotropic, spin-triplet superconductor Sr$_{2}$RuO$_{4}$ using a scanning $μ$SQUID microscope. Individual quantized vortices were seen at low magnetic fields. Coalescing vortices forming flux domains were revealed at intermediate fields. Based on our observations we suggest that a mechanism intrinsic to the material stabilizes the flux domains against the repulsive vortex-vortex interaction. Topological defects like domain walls can provide this, implying proof for unconventional chiral superconductivity.

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V. O. Dolocan, C. Veauvy, Y. Liu, F. Servant, P. Lejay, D. Mailly, K. Hasselbach. 2004-06-08. Observation of vortex coalescence in the anisotropic spin-triplet superconductor Sr$_{2}$RuO$_{4}$. https://doi.org/10.1103/physrevlett.95.097004

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