Local observation of linear-
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 superfluid density and anomalous vortex dynamics in 
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Iguchi, Y.; Zhang, Irene P.; Bauer, E. D.; Ronning, F.; Kirtley, J. R.; Moler, Kathryn A.

doi:10.1103/physrevb.103.l220503

Cited by 12 publications

(4 citation statements)

References 51 publications

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“…Nonetheless, a minority fraction of fractional vortices are theoretically allowed to form in the bulk of a superconductor owing to fluctuations, quenches, or pinning, akin to the effect of remanent vorticity in superfluids. However, fractional vortices have not been previously observed in multiband superconductors such as MgB 2 ( 28 – 30 ) and pnictides ( 31 – 33 ) nor in multiband materials where time-reversal symmetry breaking was reported ( 34 – 37 ).…”

Section: Discussionmentioning

confidence: 98%

Superconducting vortices carrying a temperature-dependent fraction of the flux quantum

Iguchi

Shi

Kihou

et al. 2023

Science

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Magnetic field penetrates type-II bulk superconductors by forming quantum vortices that enclose a magnetic flux equal to the magnetic flux quantum. The flux quantum is a universal quantity that depends only on fundamental constants. Here we investigate isolated vortices in the hole-overdoped Ba 1− x K x Fe 2 As 2 ( x = 0.77) by using scanning superconducting quantum interference device (SQUID) magnetometry. In many locations, we observed vortices that carried only part of a flux quantum, with a magnitude that varied continuously with temperature. We interpret these features as quantum vortices with non-universally quantized (fractional) magnetic flux whose magnitude is determined by the temperature-dependent parameters of a multiband superconductor. The demonstrated mobility and manipulability of the fractional vortices may enable applications in fluxonics-based computing.

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Section: Discussionmentioning

confidence: 98%

Superconducting vortices carrying a temperature-dependent fraction of the flux quantum

Iguchi

Shi

Kihou

et al. 2023

Science

Self Cite

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“…Similarly the interband coupling tends to lock phases in different bands and hence to confine fractional vortices into one-flux-quanta composite objects. While, theoretically, pinned fractional vortices are allowed to form in a bulk of superconductor, these have not been previously observed in multiband superconductors such as MgB 2 and pnictides [20][21][22][23], nor in multiband materials where time-reversal symmetry breaking was reported [24][25][26][27].…”

Section: Discussionmentioning

confidence: 99%

Observation of superconducting vortices carrying a temperature-dependent fraction of the flux quantum

Iguchi¹,

Shi²,

Kihou³

et al. 2023

Preprint

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The magnetic response is a state-defining property of superconductors. The magnetic flux penetrates type-II bulk superconductors by forming quantum vortices when the enclosed magnetic flux is equal to the magnetic flux quantum. The flux quantum is the universal quantity that depends only on the ratio of fundamental constants: the electron charge and the Planck constant. This work investigates the vortex state in the hole-overdoped Ba 1−x K x Fe 2 As 2 by using scanning superconducting quantum interference device (SQUID) magnetometry. We observed quantum vortices that carry only a fraction of the flux quantum, which vary continuously with temperature. This finding establishes the phenomenon that superconductors support quantum vortices with non-universally quantized magnetic flux. Furthermore, the demonstrations of the mobility of the fractional vortices and the manipulability of their positions open up a route for future fluxonics applications.

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“…Specifically, chiral edge states produce spontaneous currents, which generate magnetic fields. Several SQUID studies tried to directly detect these fields in Sr 2 RuO 4 (47,69) and URu 2 Si 2 (70). The signals detected were much smaller than predicted by theory (Figure 2d, left), placing strict limits on the magnitude of spontaneous currents, and on chiral domain size.…”

Section: Superconductivitymentioning

confidence: 94%

Studying Quantum Materials with Scanning SQUID Microscopy

Persky

Sochnikov

Kalisky

2022

Annu. Rev. Condens. Matter Phys.

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Electronic correlations give rise to fascinating macroscopic phenomena such as superconductivity, magnetism, and topological phases of matter. Although these phenomena manifest themselves macroscopically, fully understanding the underlying microscopic mechanisms often requires probing on multiple length scales. Spatial modulations on the mesoscopic scale are especially challenging to probe, owing to the limited range of suitable experimental techniques. Here, we review recent progress in scanning superconducting quantum interference device (SQUID) microscopy. We demonstrate how scanning SQUID combines unmatched magnetic field sensitivity and highly versatile designs, by surveying discoveries in unconventional superconductivity, exotic magnetism, topological states, and more. Finally, we discuss how SQUID microscopy can be further developed to answer the increasing demand for imaging new quantum materials. Expected final online publication date for the Annual Review of Condensed Matter Physics, Volume 13 is March 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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Local observation of linear- T superfluid density and anomalous vortex dynamics in URu2Si2

Cited by 12 publications

References 51 publications

Superconducting vortices carrying a temperature-dependent fraction of the flux quantum

Superconducting vortices carrying a temperature-dependent fraction of the flux quantum

Observation of superconducting vortices carrying a temperature-dependent fraction of the flux quantum

Studying Quantum Materials with Scanning SQUID Microscopy

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