Observation of smectic and moving-Bragg-glass phases in flowing vortex lattices

Location-sensitive measurement of the local fluctuation of driven vortex density inBi2Sr2CaCuMaeda1, Tsuboi2, Abiru3 et al. 2002Phys. Rev. B243140View full textAdd to dashboardCite

“…To elucidate this issue, several experimental efforts have been made [17,[19][20][21][22]. In particular, various imaging techniques [17,21,22] have established the existence of various states of driven vortices in conventional superconductors.…”

“…In particular, various imaging techniques [17,21,22] have established the existence of various states of driven vortices in conventional superconductors. However, for high-T c superconductors, almost nothing has been clarified, since these probes are applicable only over a limited parameter range (temperature, magnetic field, and driving force) [23][24][25].…”

Flow and Tilt-Induced Orientation of the Moving Vortex Lattice in Amorphous NbGe Superconducting Thin Films

“…1) Within the London approximation for isotropic superconductors all the possible orientations of the vortex lattice are degenerate in energy, 2,3) while this is lifted not simply by tilting an applied magnetic field, 4,5) but also when driven by applying a transport current. In experiments various imaging techniques such as Bitter decoration, 6) small angled neutron scattering 7,8) and scanning tunneling microscopy [9][10][11] have provided structural evidence for the hexagonal order in moving VLs, and some of them have shown that the lattice orientation (one of close-packed directions of the hexagonal VL) is aligned to be either parallel or perpendicular to the flow direction. These flow-induced orientations, including a reorientation between them, have been observed on both crystalline 6,10) and non-crystalline weak pinning superconductors, [12][13][14] and thus underlying crystallographic orientations are not at play.…”

“…In experiments various imaging techniques such as Bitter decoration, 6) small angled neutron scattering 7,8) and scanning tunneling microscopy [9][10][11] have provided structural evidence for the hexagonal order in moving VLs, and some of them have shown that the lattice orientation (one of close-packed directions of the hexagonal VL) is aligned to be either parallel or perpendicular to the flow direction. These flow-induced orientations, including a reorientation between them, have been observed on both crystalline 6,10) and non-crystalline weak pinning superconductors, [12][13][14] and thus underlying crystallographic orientations are not at play. It is rather essential to understand how quenched disorder affects the orientation of moving VLs.…”

Anisotropic response of the moving vortex lattice in superconducting Mo(1−x)Gex amorphous films

“…More recently Kokubo and coworkers [8] have proven this dynamical ordering from mode locking experiments. Snapshots of moving vortex structures have been obtained in decoration experiments [9,10] that have shown evidence for these smectic and moving glass phases of vortices. However one of the most striking properties of these quasi-ordered driven phases is the existence of barriers to a small force transverse to the direction of motion.…”