Comparison of flux line cutting behaviour in high Tc and conventional type II superconductors

Bianisotropic-critical-state model to study flux cutting in type-II superconductors at parallel geometry

“…Also, one can observe that the remanent magnetization of á ñ M y versus H z (á ñ M z vs H y ) tends to zero as the static-bias field H y (H z ) increases. These characteristics agree with the behavior of the corresponding experimental curves [32,33].…”

“…For this family of curves the parameters Comparing the half-wave á ñ M y versus m H z 0 of figure 5(a) with the so-called 'butterflies' of figure 6, it is observed that the area enclosed by the former family of curves is smaller than those for full-wave oscillations, in agreement with the experimental results. Indeed, the experimental curves, see figure 51 in [33], are characterized to be unique with respect to other results reported by the same group in [32] since the butterflies reached values up to an order of magnitude larger than the half-wave magnetization curves. The BCSM could qualitatively reproduce this behaviour, diminishing the anisotropic parameter  J J c y c y as the static bias field H y is increased.…”

“…The BCSM could qualitatively reproduce this behaviour, diminishing the anisotropic parameter  J J c y c y as the static bias field H y is increased. It was found that the BCSM reflects that the fluxline cutting effect has an important dependence on the magnitude and direction of the applied magnetic fields; however, the remanent magnetization of the experimental butterflies in [33] is always positive, a characteristic that was not possible to reproduce theoretically in this work.…”

“…In [30][31][32][33] were performed an extensive study on VTi samples, at different initial magnetic flux configurations in a liquid helium bath. The sample was subjected, simultaneously, to a slowly time varying magnetic field orthogonal to a stationary magnetic field; each field was directed along the length or width of the sample, that is, the applied magnetic fields were along the y−z plane.…”

Cross-flow of flux lines in the weak link regime of high-Tcsuperconductors

“…The growth of (Z?0> wa ii VS ^ * S "traditional" and not shown. Here we simply note that, experimentally and theoretically, the entry and exit of azimuthal flux is facilitated by the presence of a static H\\ [23]. For the theoretical curves, j c ± = s 2.5(10 6 ) A/m 2 , is taken independent of B (Bean approximation) in accord with the data of Fig.…”