Analysis of current-voltage characteristics of two-dimensional superconductors: Finite-size scaling behavior in the vicinity of the Kosterlitz-Thouless transition

Medvedyeva, Kateryna; Kim, Beom Jun; Minnhagen, Petter

doi:10.1103/physrevb.62.14531

Cited by 41 publications

(64 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It should be noted, however, that in real materials (even in ultrathin films) the conventional KT transition can be easily masked by other mechanisms, such as interlayer coupling, size effects, extrinsic and intrinsic weak links, thermal fluctuations, quasi-particle contributions, etc. [3,[6][7][8][9]. For example, Repaci et al…”

mentioning

confidence: 99%

Manifestation of vortex depinning transition in nonlinear current–voltage characteristics of polycrystalline superconductor Y1−xPrxBa2Cu3O7−δ

et al. 2008

View full text Add to dashboard Cite

show abstract

mentioning

confidence: 99%

Manifestation of vortex depinning transition in nonlinear current–voltage characteristics of polycrystalline superconductor Y1−xPrxBa2Cu3O7−δ

et al. 2008

View full text Add to dashboard Cite

show abstract

“…In this picture, current-induced dissociation of vortex pairs in the superconducting phase is expected to lead to nonlinear transport in the fashion, V ∝ I a with a > 3 [25]. It has been argued [26] that in a real system finite size effect can induce free vortices altering the power law I-V . The resulting I-V curves obtained in numerical simulations [26] show a pronounced peak structure in d(log V )/d(log I) resembling those shown in the inset of Fig.…”

mentioning

confidence: 99%

“…It has been argued [26] that in a real system finite size effect can induce free vortices altering the power law I-V . The resulting I-V curves obtained in numerical simulations [26] show a pronounced peak structure in d(log V )/d(log I) resembling those shown in the inset of Fig. 4(c).…”

mentioning

confidence: 99%

Origin of Nonlinear Transport across the Magnetically Induced Superconductor-Metal-Insulator Transition in Two Dimensions

et al. 2006

View full text Add to dashboard Cite

We have studied the effect of perpendicular magnetic fields and temperatures on the nonlinear electronic transport in amorphous Ta superconducting thin films. The films exhibit a magnetic field induced metallic behavior intervening the superconductor-insulator transition in the zero temperature limit. We show that the nonlinear transport in the superconducting and metallic phase is of non-thermal origin and accompanies an extraordinarily long voltage response time.In recent years, the suppression of superconductivity in two-dimensions (2D) by means of increasing disorder (usually controlled by film thickness) or applying magnetic fields has been a focus of attention. Conventional treatments [1,2,3,4,5] of electronic transport predict that in 2D the suppression of the superconductivity leads to a direct superconductor-insulator transition (SIT) in the limit of zero temperature (T = 0). This traditional view has been challenged by the observation of magnetic field (B) induced metallic behavior in amorphous MoGe [6,7,8] and Ta thin films [9]. The unexpected metallic behavior, intervening the B-driven SIT, is characterized by a drop in resistance (ρ) followed by a saturation to a finite value as T → 0. The metallic resistance can be orders of magnitude smaller than the normal state resistance (ρ n ) implying that the metallic state exists as a separate phase rather than a point in the phase diagram. Despite many theoretical treatments [8,10,11,12,13,14,15,16,17], a consensus on the mechanism behind the metallic behavior is yet to be reached. Proposed origins of the metallic behavior include bosonic interactions in the nonsuperconducting phase [10,11], contribution of fermionic quasiparticles to the conduction [12,13], and quantum phase fluctuations [14,15].In a recent paper [9] on the magnetically induced metallic behavior in Ta films, we have reported the nonlinear voltage-current (I-V ) characteristics that can be used to identify each phase. The superconducting phase is unique in having both a hysteretic I-V and an "immeasurably" small voltage response to currents below an apparent critical current I c . The metallic phase can be identified by a differential resistance (dV /dI) that increases with increasing I, whereas the insulating phase is identified by a dV /dI that decreases with increasing I. The contrasting nonlinear I-V in the metallic and insulating phase are shown in Fig. 1(a).The main purpose of this Letter is to report that the origin of the nonlinear transport, particularly in the superconducting and metallic phase, is not a simple reflection of T -dependence of ρ via the unavoidable Joule heating. We describe the effect of B and T on the nonlinear TABLE I: List of sample parameters: nominal film thickness, mean field Tc at B = 0, normal state resistivity at 4.2 K, critical magnetic field at which the resistance reaches 90% of the high field saturation value, and correlation length calculated from ξ = Φ0/2πBc where Φ0 is the flux quantum.

show abstract

“…17 Free vortices can be induced below T BKT resulting from size effects when the critical distance r c is larger than min͓W , Ќ ͔, where W is sample width. Since no free vortices are expected for r c Ӷ min͓W , Ќ ͔ size effects may yield an apparent transition, termed "ghost" transition by Medvedyeva et al 16 obeying a specific scaling behavior. Using the expression for r c given above, and since Ќ and W are both in the 100 m range, size effects are expected for current levels such that…”

Section: Resultsmentioning

confidence: 99%

Zero-magnetic-field dynamic scaling inBi2Sr2CaCu2O8
Sefrioui
¹
,
Arias
²
,
León
³

et al. 2004
Phys. Rev. B
10
0
2
0
View full text Add to dashboard Cite

We investigate the zero-magnetic-field dynamic scaling in Bi 2 Sr 2 CaCu 2 O 8 thin films from nonlinear currentvoltage ͑I-V͒ characteristics and by using the concavity criterion recently proposed by Strachan et al. [Phys. Rev. Lett. 87, 067007 (2001)]. We find that fresh samples show a BKT-like transition with z = 0.8, smaller than expected for a conventional Berezinskii-Kosterlitz-Thouless transition. The effect of sample size and finite Josephson coupling are discussed. We examine the effect of thermally-induced disorder in the oxygen sublattice finding that the BKT-like transition is suppressed by point disorder.

show abstract

Analysis of current-voltage characteristics of two-dimensional superconductors: Finite-size scaling behavior in the vicinity of the Kosterlitz-Thouless transition

Cited by 41 publications

References 20 publications

Manifestation of vortex depinning transition in nonlinear current–voltage characteristics of polycrystalline superconductor Y1−xPrxBa2Cu3O7−δ

Manifestation of vortex depinning transition in nonlinear current–voltage characteristics of polycrystalline superconductor Y1−xPrxBa2Cu3O7−δ

Origin of Nonlinear Transport across the Magnetically Induced Superconductor-Metal-Insulator Transition in Two Dimensions

Zero-magnetic-field dynamic scaling inBi2Sr2CaCu2O8
Sefrioui
¹
,
Arias
²
,
León
³

et al. 2004
Phys. Rev. B
10
0
2
0
View full text Add to dashboard Cite

Contact Info

Product

Resources

About

Analysis of current-voltage characteristics of two-dimensional superconductors: Finite-size scaling behavior in the vicinity of the Kosterlitz-Thouless transition

Cited by 41 publications

References 20 publications

Manifestation of vortex depinning transition in nonlinear current–voltage characteristics of polycrystalline superconductor Y1−xPrxBa2Cu3O7−δ

Manifestation of vortex depinning transition in nonlinear current–voltage characteristics of polycrystalline superconductor Y1−xPrxBa2Cu3O7−δ

Origin of Nonlinear Transport across the Magnetically Induced Superconductor-Metal-Insulator Transition in Two Dimensions

Zero-magnetic-field dynamic scaling inBi2Sr2CaCu2O8Sefrioui1, Arias2, León3 et al. 2004Phys. Rev. B10020View full textAdd to dashboardCite

Contact Info

Product

Resources

About

Zero-magnetic-field dynamic scaling inBi2Sr2CaCu2O8
Sefrioui
¹
,
Arias
²
,
León
³

et al. 2004
Phys. Rev. B
10
0
2
0
View full text Add to dashboard Cite