Role of current oscillations in ac-dc interference effects in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">NbSe</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Hall, R.P.; Zettl, A.

doi:10.1103/physrevb.30.2279

Cited by 40 publications

(7 citation statements)

References 13 publications

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“…Particularly important in this direction are experiments [2,3] which indicate that the current oscillations are generated locally, at the contact of samples. In spite of actual controversies regarding some of these evidences [3][4][5], they strongly support the idea [6,7] that the « periodic noise » originates from the conversion of the CDW transport to the ohmic one in the region of contacts.…”

Section: Classificationmentioning

confidence: 55%

“…We start by solving equation 2with the field (5) in which E > 1. Following the procedure of [7], the solution can be constructed by matching particular solutions in two ranges, x > 1 and x 1, A = AR + AL.…”

Section: Tmentioning

confidence: 99%

“…The straightforward extension of the problem defined by equations (1), (2) and (5) to the range of low dc fields (E 1) would therefore presumably lead to the appearance of additional terms with higher harmonics of E in the expression (8). The presence of phase factors (nE -mmo) t in these terms would then give a complete set of Shapiro steps at E = m coo, as was observed n experimentally [ 15,5].…”

Section: Tmentioning

confidence: 99%

“…This expression is expected to have the same structure for E 1. The additional term in equation (9) becomes more and more important as Ei increases, so that it may improve the fit of V vs. El and V vs. coo dependences for E, > E [14], and explain the apparent random variation of peak amplitudes in the differential resistance at high ac fields [5]. For the quantitative analysis in this direction, it is however necessary to extrapolate the expression (9) to the physical range of field (E ~ 1), as was already mentioned.…”

Section: Tmentioning

confidence: 99%

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Generation of coherent pulses by the CDW motion. Interference effects

Bjeliš

Jelčic

1985

J. Phyique Lett.

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2014 L'influence d'un champ électrique ac sur les phénomènes de transport collectif des ondes de densité de charge est analysée par l'intermédiaire du modèle de Gor'kov sur les oscillations de courant. Dans la limite asymptotique des champs forts (E ~ 1), les résonances sont trouvées aux valeurs E/m, i.e. pour les sous-harmoniques de la fréquence du fondamental. On affirme que dans le domaine expérimental des champs faibles (E ~ 1), le modèle donne les résonances pour toutes les valeurs rationnelles nE/m ainsi qu'elles ont été observées dans NbSe3. Abstract. 2014 The influence of the external ac electric field on the collective charge density wave transport is considered within Gor'kov's model of current oscillations. In the asymptotic limit of large dc fields (E ~ 1) the resonances are found at E/m, i.e. at the subharmonics of the fundamental frequency. It is claimed that in the experimental range of fields (E ~ 1) the model gives resonances at all rational values nE/m, as was observed recently in NbSe3.

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Section: Classificationmentioning

confidence: 55%

Section: Tmentioning

confidence: 99%

Section: Tmentioning

confidence: 99%

Section: Tmentioning

confidence: 99%

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Generation of coherent pulses by the CDW motion. Interference effects

Bjeliš

Jelčic

1985

J. Phyique Lett.

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“…Experimental studies on CDW revealed that, in a current-or voltage-controlled experiment, coherent current or coherent voltage oscillations appear across the sample after a threshold value of the driving current or voltage. [73][74][75][76][77][78][79][80] In the present study, we suggest that a physical mechanism concerning the density fluctuations of flux lines (or SMF lines) can be introduced as a possible mechanism for coherent voltage oscillations. Such coherent density fluctuations of flux lines (or SMF lines) can develop along the sample and can result in similar effects, as in the case of the CDWs.…”

Section: Discussionmentioning

confidence: 69%

Organization of flux line system and voltage oscillations in superconducting MgB2

Kiliç

Olutaş

Kılıç

et al. 2011

Journal of Applied Physics

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The influence of bidirectional square wave (BSW) current on the evolution of the V-t curves was studied in a polycrystalline sample of MgB 2 . Regular sinusoidal-like voltage oscillations were observed at well-defined values of the amplitude (I BSW ) and period (P I ) of the BSW current, temperature, and external magnetic field. The voltage oscillations were interpreted mainly in terms of short-and long-range spatial correlations in a flux line system, relaxation effects, and the dynamic competition between pinning and depinning. The oscillating mode was also discussed in terms of sliding charge density waves associated with density fluctuations. Alternatively, the coupling between conventional thermally activated flux creep theory and annealing of the disordered states was considered as another possible mechanism in describing the voltage oscillations. Due to the complex interplay of pinning and driving forces, the oscillating mode is correlated to the drifting of flux lines, which are in motion, and it is assumed that the majority of flux lines try to traverse the sample, but do not leave it entirely. The symmetry in voltage oscillations was attributed to the equality between flux exit and entry along the sample edges. In this process, the majority of flux lines leave the sample and the direction of motion of flux lines reverses. During the oscillatory motion, we suggest that the interaction between flux lines and pinning centers may be elastic coupling in nature, because of rigidity of the flux line lattice in MgB 2 . Non-oscillatory behavior of V-t curves measured for BSW drive with low P I was attributed pre-dominantly to the effect of pinning on the distribution of the flux lines. The vortex capacitor model could be applied to explain the voltage decays in these V-t curves. However, the voltage decays associated with switching of I BSW to dc current (I dc ) were correlated to current-induced quenched disorder and to the glassy state relaxation. Further, angular dependence of voltage oscillations reveals that the anisotropic effects are nearly negligible on the evolution of V-t curves. It was shown that the voltage oscillations can be described well by an empirical expression V(t) $ sin(wt þ /), where w is the frequency and / is the phase angle. Finally, at well-defined values of I BSW and P I of BSW current, H, and T, it was argued that the MgB 2 sample behaves like a double-integrator.

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Metastability and nonlinear dynamics of sliding charge density waves

Littlewood

1986

Physica D: Nonlinear Phenomena

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Role of current oscillations in ac-dc interference effects inNbSe3

Cited by 40 publications

References 13 publications

Generation of coherent pulses by the CDW motion. Interference effects

Generation of coherent pulses by the CDW motion. Interference effects

Organization of flux line system and voltage oscillations in superconducting MgB2

Metastability and nonlinear dynamics of sliding charge density waves

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