Effect of Rb and Cs-doping on superconducting properties of MgB2 thin films

Details Effect of Rb and Cs-doping on superconducting properties of MgB2 thin films Effect of Rb and Cs-doping on superconducting properties of MgB2 thin films

2007-09-25

arxiv.org/abs/0709.4001v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1088/0953-2048/21/2/025012

Our Rutherford backscattering spectrometry (RBS) study has found that concentrations up to 7 atomic percent of Rb and Cs can be introduced to a depth of ~700 A in MgB2 thin films by annealing in quartz ampoules containing elemental alkali metals at <350 degree centigrade. No significant change in transition temperature (Tc) was observed, in contrast to an earlier report of very high Tc (>50 K) for similar experiments on MgB2 powders. The lack of a significant change in Tc and intra-granular carrier scattering suggests that Rb and Cs diffuse into the film, but do not enter the grains. Instead, the observed changes in the electrical properties, including a significant drop in Jc and an increase in delta rho (rho300-rho40), arise from a decrease in inter-granular connectivity due to segregation of the heavy alkaline metals and other impurities (i.e. C and O) introduced into the grain boundary regions during the anneals.

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