Strong, Asymmetric Flux Pinning by Miscut-Growth-Initiated Columnar Defects in Epitaxial YBa[subscript 2]Cu[subscript 3]O[subscript 7—chi] Films
Author(s)
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.
Advisor(s)
Editor(s)
Collections
Supplementary to:
Permanent Link
Abstract
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.
Sponsor
Date
1995-03-20
Extent
1259022 bytes
Resource Type
Text
Resource Subtype
Article