Physics – Condensed Matter – Superconductivity
Scientific paper
2010-05-12
Applied Physics Express 3 (2010) 063101
Physics
Condensed Matter
Superconductivity
to be published in Applied Physics Express
Scientific paper
10.1143/APEX.3.063101
High critical current densities Jc of 4 MA/cm2 at 4 K were obtained in Co-doped BaFe2As2 (BaFe2As2:Co) epitaxial films grown directly on (La, Sr)(Al, Ta)O3 substrates by pulsed laser deposition. Use of a highly pure target and improvement of film homogeneity were the critical factors to achieve the high Jc. The improved BaFe2As2:Co epitaxial films contained almost no Fe impurity and showed high crystallinity (crystallite tilt angle delta omega = 0.5 deg and twist angle delta fai = 0.5 deg) and a sharp superconducting transition with a width of 1.1 K. It is considered that these improvements resulted in the enhanced superconducting properties comparable to those of single crystals.
Hiramatsu Hidenori
Hosono Hideo
Kamiya Toshio
Katase Takayoshi
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