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Observation of single-quantum vortex splitting in the Ba$_{1-x}$K$_x$Fe$_2$As$_2$ superconductor

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arxiv 2408.05902 v2 pith:BHH5WJEG submitted 2024-08-12 cond-mat.supr-con cond-mat.str-el

Q. Z. Zhou , B. R. Chen , B. K. Xiang , I. Timoshuk , J. Garaud , Y. Li , K. Y. Liang , Q. S. He
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Z. J. Li P. H. Zhang K. Z. Yao H. X. Yao E. Babaev V. Grinenko Y. H. Wang
This is my paper · ORCID
classification cond-mat.supr-concond-mat.str-el
keywords quantumfluxtemperaturevorticesfractionalobservationdifferentdiscovery
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abstract

Since their theoretical discovery more than a half-century ago, vortices observed in bulk superconductors have carried a quantized value of magnetic flux determined only by fundamental constants. A recent experiment reported 'unquantized' quantum vortices carrying the same fraction of flux quantum in Ba$_{0.23}$K$_{0.77}$Fe$_2$As$_2$ in a small temperature range below its superconducting critical temperature ($T_C$). Here, we use scanning superconducting quantum interference device (sSQUID) microscopy with improved sensitivity to investigate the genesis of fractional vortices in Ba$_{0.23}$K$_{0.77}$Fe$_2$As$_2$. We report the direct observation of a single-flux quantum vortex splitting into two different fractions with increasing temperature. The flux of the two fractions has opposite dependence on temperature, while the total flux sums up to one flux quantum despite their spatial separation. Overall, our study shows the existence of different fractional vortices and their stability in temperature ranging from 0.1 to 0.99 $T_C$. Besides the implications of this observation for the fundamental question of quantum vorticity, the discovery of these objects paves the way for the new platform for anyon quasiparticles and applications for fractional fluxonics.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Anisotropic and tunable vortex topology in multiband iron-based superconductors

    cond-mat.supr-con 2024-12 conditional novelty 7.0 of 10

    An in-plane magnetic-field vortex (x-vortex) in iron-based superconductors supports a simple topological phase with unpaired Majorana zero modes over a wide parameter range, unlike the previously studied z-vortex.

  2. Evidence of pseudogap and absence of spin magnetism in the time-reversal-symmetry-breaking state of Ba$_{1-x}$K$_x$Fe$_2$As$_2$

    cond-mat.supr-con 2025-01 conditional novelty 6.0 of 10

    75As NMR on Ba0.234K0.766Fe2As2 shows a pseudogap below T* of about 12 K above Tc and no spin-fluctuation enhancement at T_c^Z2, indicating the time-reversal-symmetry-broken state is nonmagnetic.

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