Effects of Neutron Irradiation on Carbon Doped MgB2 Wire Segments

We have studied the evolution of superconducting and normal state properties of neutron irradiated Mg(B\(_{.962}\)C\(_{.038}\))\(_2\) wire segments as a function of post exposure annealing time and temperature. The initial fluence fully suppressed superconductivity and resulted in an anisotropic exp...

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Bibliographic Details
Published in:arXiv.org 2005-07
Main Authors: Wilke, R H T, Bud'ko, S L, Canfield, P C, Finnemore, D K, Suplinskas, Raymond J, Farmer, J, Hannahs, S T
Format: Article
Language:English
Subjects:
Annealing
Carbon
Critical field (superconductivity)
Electrical resistivity
Evolution
Fluence
Lattice parameters
Magnesium compounds
Neutron irradiation
Neutrons
Property damage
Recovery
Segments
Superconductivity
Unit cell
Wire
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Summary:We have studied the evolution of superconducting and normal state properties of neutron irradiated Mg(B\(_{.962}\)C\(_{.038}\))\(_2\) wire segments as a function of post exposure annealing time and temperature. The initial fluence fully suppressed superconductivity and resulted in an anisotropic expansion of the unit cell. Superconductivity was restored by post-exposure annealing. The upper critical field, H\(_{c2}\)(T=0), approximately scales with T\(_c\) starting with an undamaged T\(_c\) near 37 K and H\(_{c2}\)(T=0) near 32 T. Up to an annealing temperature of 400 \(^ o\)C the recovery of T\(_c\) tends to coincide with a decrease in the normal state resistivity and a systematic recovery of the lattice parameters. Above 400 \(^ o\)C a decrease in order along the c- direction coincides with an increase in resistivity, but no apparent change in the evolution of T\(_c\) and H\(_{c2}\). To first order, it appears that carbon doping and neutron damaging effect the superconducting properties of MgB\(_2\) independently.
ISSN:2331-8422
DOI:10.48550/arxiv.0507275