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School of Materials Science and Engineering

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Author: Christen, D. K. × Author: Kroeger, D. M. × Author: Wang, Z. L. (Zhong Lin) × Has files: Yes × Type: Text ×

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Thermal stability and annealing of columnar defects in Bi₂Sr₂Ca₁Cu₂O₈/Ag superconductor

1995-08-14 , Thompson, J. R. , Paul, David , Wang, Z. L. (Zhong Lin) , Kroeger, D. M. , Christen, D. K.

This work establishes the stability at elevated temperatures of columnar defects, artificially formed in the Bi-based cupric oxide superconductor Bi₂Sr₂Ca₁Cu₂O₈ for enhanced vortex pinning. Isochronal anneals, conducted in air, led to losses of critical current density in two stages. The defects were relatively stable up to ~ 550 °C, where second stage annealing began; above this, the pinning diminished rapidly. The recrystallization and loss of columnar defects were corroborated by transmission electron microscopy.

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Strong, Asymmetric Flux Pinning by Miscut-Growth-Initiated Columnar Defects in Epitaxial YBa[subscript 2]Cu[subscript 3]O[subscript 7—chi] Films

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.

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