Dynamically induced disorder in the vortex lattice of 2H-NbSe2

The Labusch parameter of a driven flux line lattice in YBa Cu O superconducting films

“…This pinning barrier is field and temperature dependent and, therefore, the observed decrease in α depends also on these parameters. Our results are in good agreement with the conclusions obtained by transport and decoration experiments in 2H-NbSe 2 crystals [21]. In this work [21] the authors found that the number of defects in the vortex structure increases when the FLL starts to depin.…”

“…Our results are in good agreement with the conclusions obtained by transport and decoration experiments in 2H-NbSe 2 crystals [21]. In this work [21] the authors found that the number of defects in the vortex structure increases when the FLL starts to depin. The FLL becomes nearly defect-free for large enough applied currents because the vortex-vortex interaction overwhelms.…”

Dynamical Ordering of Driven Stripe Phases in Quenched Disorder

“…Cn, 89.75.Kd, 73.20.Qt, 71.45.Lr Recently, there has been considerable interest in the dynamics of driven elastic media in the presence of quenched disorder and an applied drive. Physical systems that fall into this category include vortex lattices in disordered superconductors [1][2][3][4][5][6][7][8], sliding charge-density waves [9], driven electron crystals in the presence of random impurities [10], sliding friction [11], and domain wall motion [12]. One of the most studied systems in this class is a vortex lattice driven by an applied current through disordered superconductors.…”

Nonlinear response of the static and dynamic phases of the vortex matter

“…Fig.2(a) to 2(d)) in the crystal A. In Fig.2(a), the three regimes (marked I, II and III in the figure) of J c (H), at a reduced temperature t~0.973, are summarized as follows : (1) At the lowest fields (H  10 Oe), J c varies weakly with H (region I), as expected in the individual pinning or small bundle pinning regime, noted earlier (Duarte et al 1996), (2) Above a threshold field value, marked by an arrow, J c (H) variation (in region II) closely follows the archetypal collective pinning power law (Duarte et al 1996, Larkin, 1970a, 1970bLarkin and Ovchinnikov, 1979) dependence (see the linear behaviour in region II of J c vs. H on log-log scale in Fig.2), (3) This power law regime terminates at the onset (marked by another arrow) position of the PE phenomenon (region III). On increasing the temperature (see Figs. 2(a) and 2(b) for the data at t=0.973 and 0.994), the following trends are immediately apparent: (1) the peak effect becomes progressively shallower, i.e., the ratio of J c (H) at the peak position to that at the onset of PE becomes smaller.…”