Superconducting and Normal State Properties of Neutron Irradiated MgB2

Details Superconducting and Normal State Properties of Neutron Irradiated MgB2 Superconducting and Normal State Properties of Neutron Irradiated MgB2

2005-07-07

arxiv.org/abs/cond-mat/0507185v2

Physics

Condensed Matter

Superconductivity

Updated version, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.73.134512

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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