Carbon (C)-doping has been found to increase the upper critical field in superconducting thin-film and bulk samples. However, the C effects on both and lattice parameters are very different between thin films and bulk, suggesting C may incorporate differently in the two cases. This paper combines ab initio calculations and thin-film lattice parameter measurements to explore the connection between substitutional and interstitial C in and experimental bulk and thin-film lattice parameters.
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See supplementary material at http://dx.doi.org/10.1063/1.3275867 E-JAPIAU-107-037001 for information on the computational and interstitial sites for all C concentrations.
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