Simple Route to Grow High-Quality MgB<sub>2</sub> Thin Films by Pyrolysis of Decaborane (B<sub>10</sub>H<sub>14</sub>) in Mg Vapor
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概要
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We report the growth of MgB<sub>2</sub> films by thermally decomposing decaborane (B<sub>10</sub>H<sub>14</sub>) in Mg vapor. B<sub>10</sub>H<sub>14</sub>, solid at ambient temperature and stable in air, is much more convenient to use as a boron source compared to highly explosive diborane (B<sub>2</sub>H<sub>6</sub>) which is commonly used in the hybrid physical--chemical vapor deposition of MgB<sub>2</sub> films. MgB<sub>2</sub> films were grown on $c$-cut sapphire substrates held at 400--450 °C by supplying vaporized B<sub>10</sub>H<sub>14</sub> into a pocket heater with high Mg vapor pressure. The resultant films were phase-pure, $c$-axis oriented, and in-plane aligned, and had self-field critical current density of ${\sim}3\times 10^{7}$ A/cm2 at 20 K.
- 2011-07-25
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