Scheme of ASJ reflections. At energies smaller than Δc, an incoming electron from the normal side is reflected as a hole along the same trajectory. In the superconducting side, their conversion into a Cooper pair occurs over a length scale ξ(ɛ).
The in-plane Cu-O bond length disorder strongly reduces at the critical temperature but then rises again. No anomaly is detected for the out of plane Cu-O bond disorder. After C. J. Zhang and H. Oyanagi, Phys. Rev. B 79, 064521 (2009) Copyright © 2009 American Physical Society.
The anomalous increase of Cu-O bond length disorder before the critical temperature is reached vanishes at the higher end of the superconducting dome. Adapted from Ref. 14.
Lattice disorder around BZO precipitates in an epitaxial YBCO matrix results in a large increase of the critical currents and pinning strength. (a) Magnetic field dependence of the critical currents of an YBCO–BZO enhanced film (red symbols) compared to that of a regular YBCO film (black symbols) at 77 K and 65 K. The insert shows the normalized field dependences. (b) Magnetic field dependence of the pinning strength for an YBCO–BZO enhanced film (red symbols) and of a regular YBCO film. The magnetic field dependence of the pinning strength of the conventional superconductor NbTi is shown for comparison. (After J. Gutierrez et al., Nature Mater. 6, 367 (2007). Copyright © 2007.
Article metrics loading...
Full text loading...