Formation of Superconducting Regions of MgB2 by Implantation of Boron Ions into Magnesium Substrate

Z. Trybułaa, W. Kempińskia, B. Andrzejewski a, L. Piekara-Sadya, J. Kaszyńskia, J. Piekoszewskib,c, Z. Wernerb,d, E. Richtere, F. Prokerte, J. Stanisławskib and M. Barlakb aInstitute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland bThe Andrzej Sołtan Institute for Nuclear Studies, 05-400 Otwock/Świerk, Poland cInstitute of Nuclear Chemistry and Technology, Dorodna 16, 03-145 Warszawa, Poland dInstitute of Physical Chemistry, PAS, Kasprzaka 44/52, 01-224 Warsaw, Poland eResearch Center Rossendorf Inc., Institute of Ion Beam Physics and Materials Research, P.O. Box 510119, 01314 Dresden, Germany

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Received: 24 04 2005;

The results of investigation of the MgB2 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 Tc 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.

DOI: 10.12693/APhysPolA.108.165 PACS numbers:74.70.-b, 74.78.-w