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Effect of Rb and Cs doping on superconducting properties of MgB<sub>2</sub>thin films
A Rutherford backscattering spectrometry (RBS) study has found that concentrations up to 7 at.% of Rb and Cs can be introduced to a depth of ∼700 Å in MgB2 thin films by annealing in quartz ampoules containing the elemental alkali metals at <350 °C. No significant change in transition temperature …