Physics – Condensed Matter – Superconductivity
Scientific paper
2005-09-29
Physics
Condensed Matter
Superconductivity
18 pages, 4 figures, submitted
Scientific paper
10.1016/j.physc.2006.04.016
We study the effect of 100 MeV Silicon and 200 MeV Gold ion irradiation on the inter and intra grain properties of superconducting thin films of Magnesium Diboride. Substantial decrease in inter-grain connectivity is observed, depending on irradiation dose and type of ions used. We establish that modification of sigma band scattering mechanism, and consequently the upper critical field and anisotropy, depends on the size and directional properties of the extrinsic defects. Post heavy ion irradiation, the upper critical field shows enhancement at a defect density that is five orders of magnitude less compared to neutron irradiation. The critical current density however is best improved through light ion irradiation.
Eom Chang-Beom
Giencke J. E.
Kaushik S. D.
Kumar Ravi
Mishra Phoolendra K.
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