Superconducting Regions and Kondo Effect of MgB2 Formed by Implantation of Magnesium Ions into Boron Substrate
Z. Trybułaa, W. Kempińskia, B. Andrzejewskia, L. Piekara-Sadya, J. Kaszyńskia, M. Trybułaa, J. Piekoszewskib, c, J. Stanisławskib, M. Barlakb and E. Richterd
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
dResearch Center Rossendorf Inc., Institute of Ion Beam Physics and Materials Research, P.O. Box 510119, 01314 Dresden, Germany
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Received: 25 09 2005;
The results of investigation of the polycrystalline boron implanted by magnesium and argon plasma pulse treatment are presented. The four-probe electric conductivity measurements and magnetically modulated microwave absorption showed the presence of superconducting islands below the temperature of 25 K. Below T=23 K we detected the Kondo effect, a logarithmic increase in the resistivity as the temperature is lowered, due to iron impurity.
DOI: 10.12693/APhysPolA.109.657
PACS numbers: 74.70.-b, 74.78.-w