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Superconducting and Normal State Properties of Neutron Irradiated MgB2

R. H. T. Wilke·S. L. Bud'ko·P. C. Canfield·J. Famer·S. T. Hannahs
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Abstract

We have performed a systematic study of the evolution of the superconducting and normal state properties of neutron irradiated MgB$_2$ wire segments as a function of fluence and post exposure annealing temperature and time. All fluences used suppressed the transition temperature, Tc, below 5 K and expanded the unit cell. For each annealing temperature Tc recovers with annealing time and the upper critical field, Hc2(T=0), approximately scales with Tc. By judicious choice of fluence, annealing temperature and time, the Tc of damaged MgB2 can be tuned to virtually any value between 5 and 39 K. For higher annealing temperatures and longer annealing times the recovery of Tc tends to coincide with a decrease in the normal state resistivity and a systematic recovery of the lattice parameters.

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R. H. T. Wilke, S. L. Bud'ko, P. C. Canfield, J. Famer, S. T. Hannahs. 2006-03-22. Superconducting and Normal State Properties of Neutron Irradiated MgB2. https://doi.org/10.1103/physrevb.73.134512

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