Current transport of the [001]-tilt low-angle grain boundary in high temperature superconductors

Abstract

Current transport in grain boundary is one of the crucial factors which can affect the macro-supercurrent characteristics of the high temperature superconductors. van der Laan et al. [Phys. Rev. Lett. 103, 027005 (2009)] presented the strain dependence of the critical current density with a power-law fitting function, which has been verified by many experimental measurements. Here, we present a theoretical analysis of current transport in the [001]-tilt low angle grain boundary according to the strain energy of dislocation. An analytical expression is obtained which has the similar form of the fitting function, and in which the physical characteristics of parameters are distinct, and their values are close to the reports in literature.

A direct tensile device to investigate the critical current properties in superconducting tapes

“…The reason for this enhancement is that the stretch will lead to the new dislocations of superconducting material which are always determined by the pinning characteristics of them. 9,26 A study of the effect of magnetic field on the I C is performed in the case that the magnetic field is applied parallel to the ab-planes of the sample. The normalized I C as a function of magnetic field within a magnetic field range from 0 to 2.0 T is shown in Fig.…”

Lap Joint Characteristics of the YBCO Coated Conductors Under Axial Tension

“…Once the tensile force reached the expected value, such as 50, 100, 150, 200, 225, and 250 N, the critical current was measured by the aforementioned method. In addition, in order to distinguish the reversible characteristic of critical current, which has always attracted researchers' attention [17]- [22], in the case of high tensile force such as 200, 225, and 250 N, the loading and unloading processes were conducted in the experiments. One can obtain the critical currents (or I-V curves) under loading and unloading.…”

Impact of Strain and Field Ramp Path on Thermomagnetic Instabilities in Composite Nb3sn Wires with Multi-Filaments Inside the Superconducting Coil

“…Since then, plenty of experiments [25][26][27][28][29][30][31] has been done to investigate the effects of strains on the critical current density. Lots of theoretical and numerical research have been done to characterize the strain-dependent physical properties of composite Nb3Sn wires based on constitutive models [4,18,21,[32][33][34][35][36][37], finite element models (FEM) [38][39][40][41], Ginzburg-Landau (GL) theory [42],…”