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Ustinov, A. V.; Pedersen, Niels Falsig

doi:10.1103/physrevb.72.052502

Cited by 24 publications

(20 citation statements)

References 12 publications

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“…2 (b)) should consequently result in H 0 /2-period oscillation of FFR. This is in fact the case at which Ustinov and Pedersen could observe H 0 /2-oscillation in their simulation for a single long-junction 19 . However in our experiments, some steps don't coexist at the same current due to large voltage intervals between Fiske steps and the reduced step amplitude at 50 K. Therefore the FFR oscillation was mainly affected from one step (odd or even), with the dominant H 0 -period at the current near Fiske steps.…”

mentioning

confidence: 62%

Fiske steps studied by flux-flow resistance oscillation in a narrow stack ofBi2Sr2CaCu2O8
Kim
¹
,
Wang
²
,
Hatano
³

et al. 2005
Phys. Rev. B
31
6
26
1
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We have experimentally investigated the fluxon dynamics in a narrow Bi2Sr2CaCu2O 8+d stack with junction length L ∼1.8 µm. As an evidence of high-frequency excitation by a collective cavity mode, under an (in-plane) external magnetic field, the current-voltage characteristics show prominent Fiske steps with the corresponding resonance frequencies of 75-305 GHz. Further study of flux-flow resistance oscillation with various c-axis currents clarifies the correlation with Fiske steps by distinguishing two different regions i.e., static flux-flow region at low bias current level and dynamic Fiske step region at high bias current level. PACS numbers: 72.30.+q, 74.25.Qt, 85.25.Cp In stacked Bi 2 Sr 2 CaCu 2 O 8+d (BSCCO) intrinsic Josephson junctions (IJJs), the mutual interaction between junctions is expected since the superconducting layers, with the layer thickness d = 0.3 nm, are much thinner than the London penetration depth λ L = 170 nm 1 . Under the applied magnetic field parallel to the layers, Josephson vortices in a stack form lattice configurations that depend on a constant phase shift between neighboring layers, ranging from 0 for the rectangular lattice to π for the triangular lattice (see Fig. 1 (a))2,3,4 . Under the appropriate conditions, the fluxon lattice will excite the two-dimensional cavity modes in N stacked junctions, leading to the emission of electromagnetic wave with characteristic frequency f nm ≈ mc n /2L (c n is the phase velocity of electromagnetic wave, L is the junction length, m (=1, 2, 3,. . . ) denotes L-direction mode, and n (=1, 2, 3,. . . N ) denotes the stacking direction mode)5 . The c n is given bywith the Josephson penetration depth λ J , the coupling parameter S, the junction number N and the Josephson plasma frequency ω pl 1,2,5 . Among the N different modes along the stacking direction, the mode with the lowest velocity c N is usually stimulated by a triangular vortex lattice; while for the mode with the highest velocity c 1 , a rectangular lattice is favorable 6,7 . Being driven by a c-axis bias current, the moving fluxon lattice generates flux-flow resistance (FFR) in the junctions. Recent experimental 8,9,10 and numerical 11,12 studies show that the motion of traveling fluxon lattice in the layers is reflected into the periodic oscillation of FFR under the low bias current by considering the dynamical matching between the vortex lattice and the sample edges. The H 0 /2-period oscillation of FFR is interpreted as a result of the formation of triangular lattice in a longjunction stack, where H 0 is the field for adding one flux quantum per one junction (H 0 ≡ Φ 0 /Ls, Φ 0 being the flux quantum and s the layer periodicity along the c−axis i.e. 1.5 nm) 8,11 . Recent studies indicate that when the junction size is reduced down to a few µm and approaches the short-junction stack limit (L < λ J ), the oscillation period becomes predominantly H 0 rather than H 0 /2 due to the deformation of the Josephson vortex lattice by strong interaction with junction edges 9,10 . The res...

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mentioning

confidence: 62%

Fiske steps studied by flux-flow resistance oscillation in a narrow stack ofBi2Sr2CaCu2O8
Kim
¹
,
Wang
²
,
Hatano
³

et al. 2005
Phys. Rev. B
31
6
26
1
View full text Add to dashboard Cite

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“…13 for the case of a single junction, Eq. ͑8͒ may be solved numerically to yield the -⌫ characteristic at constant bias current, which is often measured in experiments.…”

Section: Two Stacked Junctionsmentioning

confidence: 99%

“…11,12 In Ref. 13, the origin of both the ⌽ 0 and the ⌽ 0 / 2 oscillations was identified as being due to Fiske modes, 14 which are known to exist in BSCCO stacks. 15,16 In this paper, we present numerical calculations trying to illuminate the conditions for the formation of a square vortex lattice in Josephson junction stacks.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulations of flux flow in stacked Josephson junctions

Madsen

Pedersen

2005

Phys. Rev. B

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We numerically investigate Josephson vortex flux flow states in stacked Josephson junctions, motivated by recent experiments trying to observe the vortices in a square vortex lattice when a magnetic field is applied to layered high-T c superconductors of the Bi 2 Sr 2 CaCu 2 O x type. By extensive numerical simulations, we are able to clearly distinguish between triangular and square vortex lattices and to identify the parameters leading to an in-phase vortex configuration.

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“…In recent years, considerable efforts have been devoted to the study of the dynamics of Josephson vortices (fluxons) in stacks of Josephson junctions (JJs) [1][2][3][4][5][6][7][8][9][10][11][12][13]. This is, e.g., motivated by its potential to use such Josephson systems for creating high-frequency electromagnetic oscillations (see Refs.…”

Section: Introductionmentioning

confidence: 99%

Effect of ordered array of magnetic dots on the dynamics of Josephson vortices in stacked SNS Josephson junctions under DC and AC current

et al. 2015

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Abstract.We use the anisotropic time-dependent Ginzburg-Landau theory to investigate the effect of a square array of out-of-plane magnetic dots on the dynamics of Josephson vortices (fluxons) in artificial stacks of superconducting-normal-superconducting (SNS) Josephson junctions in the presence of external DC and AC currents. Periodic pinning due to the magnetic dots distorts the triangular lattice of fluxons and results in the appearance of commensurability features in the current-voltage characteristics of the system. For the larger values of the magnetization, additional peaks appear in the voltage-time characteristics of the system due to the creation and annihilation of vortex-antivortex pairs. Peculiar changes in the response of the system to the applied current is found resulting in a "superradiant" vortex-flow state at large current values, where a rectangular lattice of moving vortices is formed. Synchronizing the motion of fluxons by adding a small ac component to the biasing dc current is realized. However, we found that synchronization becomes difficult for large magnetization of the dots due to the formation of vortex-antivortex pairs.

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Origin of flux-flow resistance oscillations inBi2Sr2CaCu2O8+y

Cited by 24 publications

References 12 publications

Fiske steps studied by flux-flow resistance oscillation in a narrow stack ofBi2Sr2CaCu2O8
Kim
¹
,
Wang
²
,
Hatano
³

et al. 2005
Phys. Rev. B
31
6
26
1
View full text Add to dashboard Cite

Fiske steps studied by flux-flow resistance oscillation in a narrow stack ofBi2Sr2CaCu2O8
Kim
¹
,
Wang
²
,
Hatano
³

et al. 2005
Phys. Rev. B
31
6
26
1
View full text Add to dashboard Cite

Numerical simulations of flux flow in stacked Josephson junctions

Effect of ordered array of magnetic dots on the dynamics of Josephson vortices in stacked SNS Josephson junctions under DC and AC current

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Origin of flux-flow resistance oscillations inBi2Sr2CaCu2O8+y

Cited by 24 publications

References 12 publications

Fiske steps studied by flux-flow resistance oscillation in a narrow stack ofBi2Sr2CaCu2O8Kim1, Wang2, Hatano3 et al. 2005Phys. Rev. B316261View full textAdd to dashboardCite

Fiske steps studied by flux-flow resistance oscillation in a narrow stack ofBi2Sr2CaCu2O8Kim1, Wang2, Hatano3 et al. 2005Phys. Rev. B316261View full textAdd to dashboardCite

Numerical simulations of flux flow in stacked Josephson junctions

Effect of ordered array of magnetic dots on the dynamics of Josephson vortices in stacked SNS Josephson junctions under DC and AC current

Contact Info

Product

Resources

About

Fiske steps studied by flux-flow resistance oscillation in a narrow stack ofBi2Sr2CaCu2O8
Kim
¹
,
Wang
²
,
Hatano
³

et al. 2005
Phys. Rev. B
31
6
26
1
View full text Add to dashboard Cite

Fiske steps studied by flux-flow resistance oscillation in a narrow stack ofBi2Sr2CaCu2O8
Kim
¹
,
Wang
²
,
Hatano
³

et al. 2005
Phys. Rev. B
31
6
26
1
View full text Add to dashboard Cite