Collective vortex motion in<i>a</i>-MoGe superconducting thin films

White, W. R.; Kapitulnik, A.; Beasley, M. R.

doi:10.1103/physrevlett.70.670

Cited by 63 publications

(31 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Here we use T 0 as the sample-specific activation energy extracted from our data and U 0 as the activation energy as described in the collective pinning theory, though they imply the same physical meaning. Similar power-law behavior in ρ was observed in disordered thin-films [15][16][17] and in layered high-T c compounds [13,14], and may be indicative of the central role played by vortices in our system. Reiterating the intriguing feature in our results we note that the power-law behavior described by Eq.2 continues, uninterrupted, through B c and into the insulating state (see inset of Fig.4a).…”

supporting

confidence: 81%

Power law resistivity behavior in 2D superconductors across the magnetic field-tuned superconductor-insulator transition

et al. 2006

View full text Add to dashboard Cite

PACS. 74.25.Fy -Transport properties. PACS. 74.78.-w -Superconducting films and low-dimensional structures. PACS. 74.25.Dw -Superconductivity phase diagrams.Abstract. -We present the results of a systematic study of thin-films of amorphous indiumoxide near the superconductor-insulator transition. We show that the film's resistivity follows a simple, well-defined, power-law dependence on the perpendicular magnetic field. This dependence holds well into the insulating state. Our results suggest that a single mechanism governs the transport of our films in the superconducting as well as insulating phases.

show abstract

supporting

confidence: 81%

Power law resistivity behavior in 2D superconductors across the magnetic field-tuned superconductor-insulator transition

et al. 2006

View full text Add to dashboard Cite

show abstract

“…The fact that F p decreases as the temperature drops below T* (T*Ϸ0.5T m0 ) suggests that the rigidity of moving vortex system increases as the temperature is lowered below T*. The pinning in these films at low temperature has previously been shown to be collective, 28 so the theory of Larkin and Ovchinnikov can give us a qualitative idea of the origin of this increase in the rigidity of the moving vortex configuration. In this theory, the transverse correlation length is given by R c ϰͱ1/I c , where I c is the critical current and proportional to the average pinning force F p .…”

Section: B Non-zero-temperature Casementioning

confidence: 94%

Numerical study on the dynamics of a driven disordered vortex lattice

2000

View full text Add to dashboard Cite

Using a model of long-range interactions between vortices, we numerically investigate the dynamics of a driven vortex lattice subject to the randomly distributed pointlike pinning centers in a thin superconducting film. At zero temperature, crossover from elastic to plastic depinnings is observed with increasing density of pinning centers. With the lattice softness, the scaling fit between force and velocity obtained in the elastic regime becomes invalid when the plastic flow appears. The peak effect occurs when one enters the plastic regime and the lattice tearing first enhances the critical current density j c and then suppresses it. ''Steps'' in the curve of velocity-force dependence and its differential are also found in the plastic regime. For the finitetemperature case, we see evidence of plastic and filamentary flow at low driving forces and temperatures. At high driving forces and low enough temperatures, evidence of an ordering of the moving vortices is seen in the flux flow regime. Our results are in agreement with all the previous simulations and recent experiments.

show abstract

“…The crossover between bulk and surface transport regimes with changing field, temperature, or current was observed experimentally in thin MoGe films. 28 Below we find functional form of current-voltage curves for 3D and 2D superconductors.…”

Section: Transport Critical Current J C and Surface Resistivitymentioning

confidence: 97%

Transport properties of high-temperature superconductors: Surface vs bulk effect

1996

View full text Add to dashboard Cite

We investigate surface-related transport properties of high-temperature superconductors. We find the mean vortex velocity under applied transport current determined by the activation energies for vortex penetration and exit through the Bean-Livingston barrier. We determine the current distribution between the surfaces of superconductor and the field and current dependencies of the transport activation energies. For a threedimensional superconductor the transport activation energy, U s 3D , is found to decrease with the external field, H, and transport current, J, as U s 3D ϰH Ϫ1/2 and U s 3D ϰJ Ϫ1/2 , respectively. In the quasi-two-dimensional compounds, U s 2D decays logarithmically with field and current. The interplay between the surface and the bulk contributions to the transport properties, such as current-voltage characteristics, is discussed.

show abstract

Collective vortex motion ina-MoGe superconducting thin films

Cited by 63 publications

References 17 publications

Power law resistivity behavior in 2D superconductors across the magnetic field-tuned superconductor-insulator transition

Power law resistivity behavior in 2D superconductors across the magnetic field-tuned superconductor-insulator transition

Numerical study on the dynamics of a driven disordered vortex lattice

Transport properties of high-temperature superconductors: Surface vs bulk effect

Contact Info

Product

Resources

About