Superconducting properties of MgB₂ probed by radiation-induced disordering
Karkin, A. E. · Voronin, V. I. · Dyachkova, T. V. · Tyutyunnik, A. P. · Zubkov, V. G. · Zainulin, Yu. G. · Goshchitskii, B. N.
Original · EN
The electrical resistivity ρ and upper critical field Hc₂ were measured in MgB₂ disordered by nuclear reactor neutrons. We found that superconducting temperature Tc decreases under irradiation from 40 to 5 K. Despite strong disordering (more than 10 dpa (displacements per atom)), the initial crystal structure is preserved. The residual resistivity ρ₀ increases from 0.35 to 2 mΩ cm while -dHc₂/dT remains approximately unchanged (-dHc₂/dT ≈ 0.5 T/K), and such behavior may be interpreted as decrease in the density of electronic states.
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