Competing pinning mechanisms inBi2Sr2

Guang Yang

¹

,

Ping Shang

²

,

S. Sutton

³

et al.

Influence of chemical pressure effects on nonlinear thermal conductivity of intrinsically granular superconductors

“…Recall that under plastic deformation, grain boundaries (GBs) (which are the natural sources of weak links in HTS), move rather rapidly via the movement of the grain boundary dislocations (GBDs) comprising these GBs. At the same time, observed [1,3,9,10,11] in HTS single crystals regular 2D dislocation networks of oxygen depleted regions (generated by the …”

Static and Dynamic Coupling Transitions of Vortex Lattices in Disordered Anisotropic Superconductors

“…Such two-dimensional (2D) behavior has also been seen in transformer experiments [5]. Thus in layered superconductors two different effective dimensionalities of the vortex pancake lattice may appear, each with different characteristic properties.Layered superconductors exhibit a striking second peak in magnetization measurements [4,[6][7][8][9][10], corresponding to an abrupt increase in the critical current of the material as the applied field is increased. This second peak is especially sharp in BSCCO, as shown in local Hall probe measurements [7,9,10] and recent Josephson plasma frequency measurements [11].…”

Polarization effects induced by a magnetic field in intrinsically granular superconductors

“…This more complex structure of the effective charge appears when the applied magnetic field B matches an intrinsic chemomagnetic field B µ (δ(B)) (which now also depends on B via the magnetoconcentration effect). Notice that a "fishtail" structure of Q(δ(B), B) manifests itself even at zero values of field-free deficiency parameter δ(0) (solid line in Fig.4) thus confirming a field-induced nature of intrinsic granularity [13,[17][18][19][20]. Likewise, Fig.5 depicts the evolution of the effective flux capacitance C(δ(B), B) in applied magnetic field B/B 0 in the presence of magnetoconcentration effect (Cf.…”

“…Recall that the observed [13,[17][18][19][20] in HTS single crystals regular 2D dislocation networks of oxygen depleted regions with the size d 0 of a few Burgers vectors can provide quite a realistic possibility for existence of 2D Josephson network within CuO plane [21,22]. In this regard, it is also important to mention the pioneer works by Khaikin and Khlyustikov [23][24][25] on twinning-induced superconductivity in dislocated crystals.…”