ACTA

Superconducting Regions and Kondo Effect of MgB₂ Formed by Implantation of Magnesium Ions into Boron Substrate

Z. Trybuła^a, W. Kempiński^a, B. Andrzejewski^a, L. Piekara-Sady^a, J. Kaszyński^a, M. Trybuła^a, J. Piekoszewski^{b, c}, J. Stanisławski^b, M. Barlak^b and E. Richter^d
^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

Full Text PDF

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