Microstructure design by twinning in high-temperature superconductor YBa2Cu3O7−δ for enhanced Jc at high magnetic fields

Dislocation description of twins in high-temperature superconductor YBa2Cu3O7−δ

“…spacing method (see, for example, [37]). It was also used for investigation of the temperature dependence of M and twin boundary energy in YBCO [39].…”

“…Boyko and S.W. Chan in [37] by comparing pinning capability of different microstructures: system of plane-parallel twin lamellas; system of wedgeshaped twins; microstructure composed of twin intersections. The twin intersections are very strong pinning centers [36,47].…”

“…To improve magnetic properties of YBCO we should investigate possibilities to decrease g tw , R col . A pinning capability of corresponding basic units of the twin microstructure also should be taken into account (for details see [37]). …”

“…Therefore, the description of twin microstructure formation in YBCO has risen as an important problem. Some aspects of applicability of the thin twins theory to the description of twins in YBCO were successfully demonstrated in our joint investigations with group of Professor Chan from Columbia University [31][32][33][34][35][36][37]. In this article, we describe the application of the thin twins theory developed mainly for description of mechanical twinning, to the description of the twin structures in the YBa Cu O 2 3 7-d .…”

Twin boundary energy and characterization of charge redistribution near the twin boundaries of cupperate superconductors

“…On the other hand, one major problem in high-T c material technology is their low current carrying capability of the sintered ceramic materials. Their critical currents, J c , at 77 K and zero magnetic field, is typically between 100 and 1000 A/cm 2 which is at least two orders of magnitude lower than the needs for large scale applications [9][10][11][12]. Therefore, it is important to study the limiting factors of the critical current for practical purposes and obviously, anisotropic grains, grain boundaries, phase impurity and oxygen deficiency are among the important factors.…”