Properties of MgB2 thin films with carbon doping

Details Properties of MgB2 thin films with carbon doping Properties of MgB2 thin films with carbon doping

2004-07-07

arxiv.org/abs/cond-mat/0407146v1

Physics

Condensed Matter

Superconductivity

12 pages, 5 figures

Scientific paper

10.1063/1.1782258

We have studied structural and superconducting properties of MgB2 thin films doped with carbon during the hybrid physical-chemical vapor deposition process. A carbon-containing metalorganic precursor bis(cyclopentadienyl)magnesium was added to the carrier gas to achieve carbon doping. As the amount of carbon in the films increases, the resistivity increases, Tc decreases, and the upper critical field increases dramatically as compared to the clean films. The self-field Jc in the carbon-doped films is lower than that in the clean films, but Jc remains relatively high to much higher magnetic fields, indicating stronger pinning. Structurally, the doped films are textured with nano-grains and highly resistive amorphous areas at the grain boundaries. The carbon doping approach can be used to produce MgB2 materials for high magnetic field applications.

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