Critical current in thin flat superconductors with Bean-Livingston and geometrical barriers

Mikitik, G. P.

doi:10.1103/physrevb.104.094526

Cited by 8 publications

(3 citation statements)

References 53 publications

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“…According to the previous studies, the H dependence of I c showed a sharp peak. 19,20,[36][37][38] This behavior has been observed in the thin film of V and Nb, 21) however, in our thin film, there were broad peaks around H = −15 Oe for I + and H = 15 Oe for I − . Further, there was a difference between the H at which the I c and η showed maximum.…”

supporting

confidence: 65%

Nonreciprocal supercurrent in thin film of type II superconducting Sn

Ohkuma

Matsumoto

Takano

2023

Appl. Phys. Express

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The nonreciprocal supercurrent, namely the superconducting diode effect, can be realized with various mechanisms. The recent study has demonstrated the superconducting diode effect on thin films under the out-of-plane magnetic field, owing to the asymmetric Bean-Livingston barrier on the edge. In this study, we investigated the nonreciprocal supercurrent in a thin film of Sn deposited on the diamond substrate. The Ginzburg-Landau parameter κ in the thin film was estimated to be 0.711 that is slightly higher than 1/√2 (0.707). We observed the nonreciprocal supercurrent owing to the asymmetric energy barrier for flux penetration on the edge.

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confidence: 65%

Nonreciprocal supercurrent in thin film of type II superconducting Sn

Ohkuma

Matsumoto

Takano

2023

Appl. Phys. Express

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“…[4] The effects of the current streamline bending on the vortex dynamics can be probed, for instance, via the artificial introduction of a single edge defect. [5][6][7] An edge defect locally suppresses the energy barrier for the vortex entry [8] and acts as a gate for fluxons which then cross the superconducting constriction under the action of the transport current. [9] The repulsive interaction between vortices stipulates their arrangement in the form of a vortex jet, [10] which has an apex at the defect and diverges toward the opposite edge of the constriction, see Figure 1b.…”

Section: Introductionmentioning

confidence: 99%

Vortex Chains and Vortex Jets in MoSi Microbridges

Bevz

Budinská

Lamb-Camarena

et al. 2023

Physica Rapid Research Ltrs

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Superconducting bridges exhibit many properties of a Josephson junction, such as the electromagnetic radiation at overcritical currents and steps in the microwave‐irradiated current–voltage (I–V) curves. These Josephson effects stem from the periodic motion of magnetic flux quanta (vortices) in the narrowest region of the bridge. According to the Aslamazov and Larkin (AL) theory, the I–V curve of such a constriction should exhibit voltage kinks each time the number of vortices in the 1D vortex chain is increased by one. However, in the presence of defects and fluctuations, the intervortex repulsion stipulates the formation of a 2D vortex jet, which goes beyond the 1D AL model. Here, by milling one or two slits across a MoSi thin strip, we make vortices to move in a vortex–jet or a vortex–chain fashion, respectively. Unexpectedly, for the strip with a vortex jet, we observe equidistant voltage kinks at transport currents which are rather far from the assumption of in the AL model. At the moment, we have no explanation for this observation, tending to attribute it to fast relaxation processes in MoSi and looking forward for a comparison with other superconducting materials.

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“…The geometrical barrier originates from the shape of the superconductor and it appears for samples different from an ellipsoid. In the case of superconductor thin strips with thickness d ≪ λ , in which vortices interact mostly via the stray fields in the surrounding space, the vortex-vortex and vortex-image interaction length scale is determined by the noticeably larger effective penetration depth * Corresponding author: oleksandr.dobrovolskiy@univie.ac.at λ eff = λ 2 /d [30,31] while effects of the geometrical barrier are not essential [32].…”

Section: Introductionmentioning

confidence: 99%

Vortex jets generated by edge defects in current-carrying superconductor thin strips

Bezuglyj,

Shklovskij,

Budinska

et al. 2022

Preprint

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At sufficiently large transport currents I tr , a defect at the edge of a superconducting strip acts as a gate for the vortices entering into it. These vortices form a jet, which is narrow near the defect and expands due to the repulsion of vortices as they move to the opposite edge of the strip, giving rise to a transverse voltage V ⊥ . Here, relying upon the equation of vortex motion under competing vortex-vortex and I tr -vortex interactions, we derive the vortex jet shapes in narrow (ξ ≪ w λ eff ) and wide (w ≫ λ eff ) strips [ξ : coherence length, w: strip width, λ eff : effective penetration depth]. We predict a nonmonotonic dependence V ⊥ (I tr ) which can be measured with Hall voltage leads placed on the line V 1 V 2 at a small distance l apart from the edge defect and which changes its sign upon l −l reversal. For narrow strips, we compare the theoretical predictions with experiment, by fitting the V ⊥ (I tr , l) data for 1 µm-wide MoSi strips with single edge defects milled by a focused ion beam at distances l = 16-80 nm from the line V 1 V 2 . For wide strips, the derived magnetic-field dependence of the vortex jet shape is in line with the recent experimental observations for vortices moving in Pb bridges with a narrowing. Our findings are augmented with the time-dependent Ginzburg-Landau simulations which reproduce the calculated vortex jet shapes and the V ⊥ (I tr , l) maxima. Furthermore, with increase of I tr , the numerical modeling unveils the evolution of vortex jets to vortex rivers, complementing the analytical theory in the entire range of I tr .

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Critical current in thin flat superconductors with Bean-Livingston and geometrical barriers

Cited by 8 publications

References 53 publications

Nonreciprocal supercurrent in thin film of type II superconducting Sn

Nonreciprocal supercurrent in thin film of type II superconducting Sn

Vortex Chains and Vortex Jets in MoSi Microbridges

Vortex jets generated by edge defects in current-carrying superconductor thin strips

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