RF Plasma Synthesis: A Novel Technique for Preparation of High Critical Field ``Dirty'' MgB$_{2}$

It has been shown, both theoretically as well as experimentally, that very high critical fields can be achieved in ``dirty'' MgB$_{2}$ superconductors. However, controlled homogeneous doping/alloying has thus far remained a challenge. A novel technique of rf plasma sputtering of ``dirty'' MgB$_{2}$ is hence being developed. This technique promises a potential for the synthesis of powders with homogeneous doping/alloying in the crystal lattice. Spatial temperature profile in the plasma plume is helpful, especially for the case of MgB$_{2}$ where the reacting species have very different vaporizing temperatures. Details of the design concept and preliminary results will be presented.