TY - JOUR
AU - T.S Ravi
AU - D.M Hwang
AU - Ramamoorthy Ramesh
AU - S.W Chan
AU - L Nazar
AU - C.Y Chen
AU - A Inam
AU - T Venkatesan
AB - Y-Ba-Cu-O thin films were deposited on [001] MgO using pulsed laser deposition. The films are granular with the c axis normal to the surface and the a-b axes locked into several preferred orientations. The grain sizes range from a few hundred to a few thousand nanometers. The misorientation of the Y-Ba-Cu-O grains with respect to the MgO could be predicted by a modified version of the coincident site lattice theory, where near coincidence as opposed to exact coincidence is sought. The resulting boundaries between adjacent Y-Ba-Cu-O grains were found to be dominated by four types of low-energy boundaries, namely, low-angle, special crystallographic, near special crystallographic, and high-angle noncrystallographic boundaries. The critical current observed in this material is as high as 5×105 A cm-2 at 77 K and is believed to be a result of clean, low-energy boundaries with a high density of connected Cu-O-Cu bonds in adjacent Y-Ba-Cu-O grains. © 1990 The American Physical Society.
BT - Physical Review B
DO - 10.1103/PhysRevB.42.10141
LA - eng
M1 - 16
N1 - cited By 44
N2 - Y-Ba-Cu-O thin films were deposited on [001] MgO using pulsed laser deposition. The films are granular with the c axis normal to the surface and the a-b axes locked into several preferred orientations. The grain sizes range from a few hundred to a few thousand nanometers. The misorientation of the Y-Ba-Cu-O grains with respect to the MgO could be predicted by a modified version of the coincident site lattice theory, where near coincidence as opposed to exact coincidence is sought. The resulting boundaries between adjacent Y-Ba-Cu-O grains were found to be dominated by four types of low-energy boundaries, namely, low-angle, special crystallographic, near special crystallographic, and high-angle noncrystallographic boundaries. The critical current observed in this material is as high as 5×105 A cm-2 at 77 K and is believed to be a result of clean, low-energy boundaries with a high density of connected Cu-O-Cu bonds in adjacent Y-Ba-Cu-O grains. © 1990 The American Physical Society.
PY - 1990
SP - 10141
EP - 10151
T2 - Physical Review B
TI - Grain boundaries and interfaces in Y-Ba-Cu-O films laser deposited on single-crystal MgO
VL - 42
SN - 01631829
ER -