Full text loading...
(a) The a-b plane-view TEM image showing the occurrence of twin lamellae on both sides of a nanocrystalline band. Inset: SAD pattern of the lower region. (b) TEM micrograph and SAD pattern of a nanocrystalline band. (c) The plane-view TEM image of a twin complex boundary with arrays of emerging accommodation nanotwins. Dashed lines indicate the thickness and orientation of a cross-sectional sample for plane-view imaging [Fig. 1(d)]. (d) c-b plane-view TEM image of a complex twin boundary. Arrows indicate crystallographic directions.
Temperature dependence of the irreversibility lines for YBCO with the periodical TB structure and for the reference sample without TB. The inset shows the temperature dependence of the critical current density for YBCO with and without nanoscale TB.
The irreversibility temperature plotted as a function of .
Temperature and current density dependence of the activation energy of YBCO with nanoscale TB in applied fields: 1 and 2 T (inset). The solid lines are fits of the data to Eq. (3).
Temperature and current density dependence of the activation energy of YBCO with nanoscale TB in an applied field of 4 T. The solid lines are fits of the data to Eq. (3).
Article metrics loading...