Flux-periodicity crossover from<i>h/2e</i>to<i>h/e</i>in aluminium nano-loops

Espy, Christopher; Sharon, Omri J.; Braun, Julian; Garreis, Rebekka; Strigl, Florian; Shaulov, A.; Leiderer, Paul; Scheer, Elke; Yeshurun, Y.

doi:10.1088/1742-6596/969/1/012063

Cited by 3 publications

(5 citation statements)

References 9 publications

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“…It can also be observed that the shape of the oscillations broadens with temperature. At higher temperatures their broad shape is similar to that observed for a SQUID …”

Section: Magnetoresistance Characterizationsupporting

confidence: 76%

“…At higher temperatures their broad shape is similar to that observed for a SQUID. 41 There are a number of resistance steps in the data presented in Figure 3b indicated with arrows for the 0.1 K data set. The step at 14.5 mT is associated with the superconducting transition of the Al contact pad, whereas the larger step around 135 mT corresponds to that of the AlSi component of the device.…”

Section: ■ Magnetoresistance Characterizationmentioning

confidence: 99%

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Silicon–Aluminum Phase-Transformation-Induced Superconducting Rings

et al. 2022

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The development of devices that exhibit both superconducting and semiconducting properties is an important endeavor for emerging quantum technologies. We investigate superconducting nanowires fabricated on a silicon-on-insulator (SOI) platform. Aluminum from deposited contact electrodes is found to interdiffuse with Si along the entire length of the nanowire, over micrometer length scales and at temperatures well below the Al–Si eutectic. The phase-transformed material is conformal with the predefined device patterns. The superconducting properties of a transformed mesoscopic ring formed on a SOI platform are investigated. Low-temperature magnetoresistance oscillations, quantized in units of the fluxoid, h/2e, are observed.

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“…It can also be observed that the shape of the oscillations broadens with temperature. At higher temperatures their broad shape is similar to that observed for a SQUID …”

Section: Magnetoresistance Characterizationsupporting

confidence: 76%

Section: ■ Magnetoresistance Characterizationmentioning

confidence: 99%

Silicon–Aluminum Phase-Transformation-Induced Superconducting Rings

et al. 2022

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“…There is no the emergence of the hc/e flux periodicity in the T c (ϕ) oscillation. The obtained results agree with the magnetoresistance measurements performed on Al [9], Nb [10], and AlSi [11] nano-rings. The flux periodicity of hc/2e has been observed at low bias currents and at temperatures close to T c .…”

Section: Numerical Resultssupporting

confidence: 88%

Universality of flux quantum in an s-wave superconducting ring

Nisaisue,

Krunavakarn

2023

J. Phys.: Conf. Ser.

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A problem of the crossover of the flux periodicity in an s-wave superconducting ring whether a period hc/e arises instead of hc/2e is studied in the basis of the linearized Ginzburg-Landau equation for the order parameter. We analyze the behavior of the Little-Parks oscillations for a one-dimensional superconducting ring threaded by an external magnetic flux and find the period of the magnetic flux is strictly hc/2e independent of the radius of the ring. The obtained result shows the universality of a superconducting flux quantum.

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“…27 Experimental efforts to detect the h/e periodicity in nanorings were partially successful. 28,29 Clearly, the physical origin of the h/e periodicity observed in our Nb ring is different, as the size of the ring is much larger than the coherence length (ξ 0 ≈ 40 nm).…”

Section: Nano Lettersmentioning

confidence: 86%

“…For example, an h/e flux periodicity was predicted for s-wave nanorings with a size smaller than the coherence length, ξ 0 . Experimental efforts to detect the h / e periodicity in nanorings were partially successful. , Clearly, the physical origin of the h /e periodicity observed in our Nb ring is different, as the size of the ring is much larger than the coherence length (ξ 0 ≈ 40 nm).…”

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confidence: 88%

Current-Induced Crossover of Flux Periodicity from h/2e to h/e in a Superconducting Nb Nano-Ring

et al. 2018

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Magnetoresistance measurements in a granular Nb nanoring reveal current-induced crossover between two distinct quantum coherence effects. At low bias currents, Cooper-pair coherence is manifested by Little–Parks oscillations with flux periodicity of h/2e. At high bias currents, magnetoresistance oscillations with flux periods of h/e are observed and interpreted as Aharonov–Bohm oscillations, reflecting the phase coherence of individual quasi-particles. The model explaining these data views the ring as a chain of superconducting grains weakly coupled by tunnel junctions. Low bias currents allow coherent tunneling of Cooper pairs between the grains. Increasing the current above the critical current of all the junctions creates a quasi-particles conduction channel along the ring, allowing for quantum interference of quasi-particles.

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Flux-periodicity crossover fromh/2etoh/ein aluminium nano-loops

Cited by 3 publications

References 9 publications

Silicon–Aluminum Phase-Transformation-Induced Superconducting Rings

Silicon–Aluminum Phase-Transformation-Induced Superconducting Rings

Universality of flux quantum in an s-wave superconducting ring

Current-Induced Crossover of Flux Periodicity from h/2e to h/e in a Superconducting Nb Nano-Ring

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