Correlation of Vortex Motion in High-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="italic">T</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>Superconductors

Lee, Thomas S.; Missert, Nancy A.; Sagdahl, Lise T.; Clarke, John; Clem, John R.; Char, K.; Eckstein, J. N.; Fork, D. K.; Lombardo, L. W.; Kapitulnik, A.; Schneemeyer, Lynn; Waszczak, J. V.; Dover, R. B. van

doi:10.1103/physrevlett.74.2796

Cited by 14 publications

(13 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Very recently, there have been successful experiments that detected the thermal motion of individual FLs at nominally zero magnetic field and bulk current using SQUID probes, and analyzed the noise correlation between the two ends of the FL [38]. A refinement of such techniques may eventually enable a direct comparison of theoretical results with experiments.…”

Section: Generalizationsmentioning

confidence: 99%

Anisotropic scaling in threshold critical dynamics of driven directed lines

Ertaş

Kardar

1996

Phys. Rev. B

View full text Add to dashboard Cite

The dynamical critical behavior of a single directed line driven in a random medium near the depinning threshold is studied both analytically (by renormalization group) and numerically, in the context of a Flux Line in a Type-II superconductor with a bulk current J. In the absence of transverse fluctuations, the system reduces to recently studied models of interface depinning. In most cases, the presence of transverse fluctuations are found not to influence the critical exponents that describe longitudinal correlations. For a manifold with d = 4 − ǫ internal dimensions, longitudinal fluctuations in an isotropic medium are described by a roughness exponent ζ = ǫ/3 to all orders in ǫ, and a dynamical exponent z = 2 − 2ǫ/9 + O(ǫ 2 ). Transverse fluctuations have a distinct and smaller roughness exponent ζ ⊥ = ζ − d/2 for an isotropic medium. Furthermore, their relaxation is much slower, characterized by a dynamical exponent z ⊥ = z + 1/ν, where ν = 1/(2 − ζ ) is the correlation length exponent. The predicted exponents agree well with numerical results for a flux line in three dimensions. As in the case of interface depinning models, anisotropy leads to additional universality classes. A nonzero Hall angle, which has no analogue in the interface models, also affects the critical behavior.74.60. Ge, 05.40.+j, 05.60.+w, 64.60.Ht

show abstract

Section: Generalizationsmentioning

confidence: 99%

Anisotropic scaling in threshold critical dynamics of driven directed lines

Ertaş

Kardar

1996

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…The loss of correlation between movements of the opposite ends of vortices was observed experimentally in Ref. 7. The experiments consisted in measuring the correlation function for the low-frequency 1/f and random telegraph noise flux fluctuations in Y-Ba-Cu-C and Bi-Sr-Ca-Cu-O films and crystals, in nominally zero applied field.…”

Section: Discussionmentioning

confidence: 85%

“…7 It was found that the coherent and incoherent vortex motions are mostly due to pinning along the axis of a flux stack. When one of the pancakes was pinned much stronger than any other pancake of the stack, then both ends of the flux line could move independently and the correlation in the magnetic noise was lost.…”

Section: Introductionmentioning

confidence: 99%

Cross correlation of thermal flux noise in layered superconductors

1996

View full text Add to dashboard Cite

Cross correlation in the magnetic flux noise due to thermally activated movements of pancake vortices in strongly anisotropic layered superconductors has been investigated theoretically. It has been shown that there exists a crossover frequency, inversely proportional to the sample thickness, below which vortices behave as rigid rods and their ends move coherently on the opposite sides of the sample. At low frequencies, the cross-correlation spectrum is identical to the spectrum measured at each side of the sample. The crosscorrelation spectrum demonstrates two regimes of behavior, separated by a characteristic frequency which depends on the geometry of the flux measuring loop. At high frequencies above the crossover frequency, the excitations of the elastic lattice modes lead to exponentially vanishing oscillations of the cross-correlation spectra. Pancake movements became incoherent and the correlation function decays, accompanied by the oscillations. The oscillations are most pronounced for the separation between pickup loops smaller than the sample thickness. In a typical experimental configuration with pickup loops located on the sample surface, the oscillations constitute only small perturbations to the dominating powerlike decay of the correlation function.

show abstract

“…1/f -like noise is frequently accompanied by characteristic non-Gaussian random telegraph noise (RTN) components. Telegraph signals in HTSC systems were detected in magnetic flux noise at low [5][6][7] and high magnetic fields [8], magnetically modulated microwave absorption [9] and in voltages appearing across dc current biased thin films [3,[10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Quiet and noisy metastable voltage states in high-Tc superconductors

2000

View full text Add to dashboard Cite

The interaction between the telegraph noise and background voltage fluctuations in the current induced dissipative state of high-T c BiSrCaCuO thin films has been investigated. Experimental time records of the voltage drop across current biased thin film strips show markedly different background noise traces in the up and down telegraph states. Detailed analysis demonstrates that fluctuations around the telegraph voltage levels are due to a unique background noise process. The apparent quiet and noisy voltage states are due only to differences in the effective frequency bandwidth at which background noise is seen at distinct telegraph levels. Changes of the background noise variance ratio with changing bias current follow changes of the statistical average lifetimes of the random telegraph process.

show abstract

Correlation of Vortex Motion in High-TcSuperconductors

Cited by 14 publications

References 13 publications

Anisotropic scaling in threshold critical dynamics of driven directed lines

Anisotropic scaling in threshold critical dynamics of driven directed lines

Cross correlation of thermal flux noise in layered superconductors

Quiet and noisy metastable voltage states in high-Tc superconductors

Contact Info

Product

Resources

About