Formation of Superconducting Regions of MgB2by Implantation of Boron Ions into Magnesium Substrate

The results of investigation of the MgB 2 inter-metallic compound with the use of boron ions implantation and plasma pulse treatment are presented.The samples were characterized by: four-probe electric conductivity measurements, magnetically modulated microwave absorption, and magnetic measurements.For hydrogen and argon pulsed plasma treatment the samples with T c ranging from 10 K to 32 K were obtained.The superconducting phase does not form a continuous layer since the resistivity does not fall down to zero.Apparently, separate islands of superconducting phase are connected through metallic Mg paths.All samples are still below the percolation threshold.