Effects of Neutron Irradiation on Carbon Doped MgB2 Wire Segments

Details Effects of Neutron Irradiation on Carbon Doped MgB2 Wire Segments Effects of Neutron Irradiation on Carbon Doped MgB2 Wire Segments

2005-07-12

arxiv.org/abs/cond-mat/0507275v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1088/0953-2048/19/6/024

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.

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