Organizational Unit:
School of Materials Science and Engineering
School of Materials Science and Engineering
1995-03-20
,
Lowndes, D. H.
,
Christen, D. K.
,
Klabunde, C. E.
,
Wang, Z. L. (Zhong Lin)
,
Kroeger, D. M.
,
Budai, J. D.
,
Zhu, Shen
,
Norton, D. P.
Strong flux pinning and a pronounced asymmetric angular dependence of J[subscript c]([eta, theta]) have been discovered in YBa[subscript 2]Cu[subscript 3]O[subscript 7—chi] films grown on miscut, mosaic LaAlO[subscript 3] substrate surfaces. A new pinning peak, which at low fields is nearly as strong as the “intrinsic pinning,” is observed for magnetic field orientations between the c axis and the CuO[subscript 2] plane. Cross-section transmission electron microscopy reveals columnar growth defects (2–3 nm diameter) aligned near the c axis, in concentrations ~10[superscript 10] cm[subscript —2]. The results demonstrate that deliberately modified substrate surfaces may introduce technologically useful flux pinning in YBa[subscript 2]Cu[subscript 3]O[subscript 7—chi] films.