Neutron Irradiation of Mg11B2 : From the Enhancement to the Suppression of Superconducting Properties

Abstract

In this letter we present the effect of neutron irradiation up to fluences of 3.9 1019 n/cm2 on the superconducting properties of MgB2. In order to obtain a disorder structure homogeneously distributed, the experiment was carried out on bulk samples prepared with the 11B isotope. Up to fluences of 1018 n/cm2 the critical temperature is slightly diminished (36 K) and the superconducting properties are significantly improved; the upper critical field is increased from 13.5 T to 20.3 T at 12 K and the irreversibility field is doubled at 5 K. For larger neutron fluences the critical temperature is suppressed down to 12 K and the superconducting properties come out strongly degraded.

13 pages, 4 figures. Submitted to Appl.Phys.Lett

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• Enhanced flux pinning in neutron irradiated MgB2
• Superconducting and Normal State Properties of Neutron Irradiated MgB2
• Influence of the upper critical field anisotropy on the transport properties of polycrystalline MgB${}_2$
• Effect of damage by 2-MeV He ions and annealing on Hc2 in MgB2 thin films
• Physical Property Characterization of Bulk MgB2 Superconductor
• Tuning topological disorder in MgB${}_2$
• Systematic study of disorder induced by neutron irradiation in MgB2 thin films
• Magnetoresistivity in MgB2 as a probe of disorder in p- and s-bands
• Point-contact spectroscopy in neutron-irradiated Mg^{11}B_2
• Intraband versus interband scattering rate effects in neutron irradiated MgB2
• Role of charge doping and lattice distortions in codoped Mg_{1-x}(AlLi)_{x}B_2 compounds
• Upper Critical Fields up to 60T in Dirty Magnesium Diboride Thin Films
• Hydrostatic pressure induced transition from δTc to δl pinning mechanism in MgB2
• Disorder effects and current percolation in FeAs based superconductors
• Superconductivity in iron silicide Lu2Fe3Si5 probed by radiation-induced disordering
• Modification of intergrain connectivity, upper critical field anisotropy, and critical current density in ion irradiated MgB2 films
• MgB2 coated superconducting tapes with high critical current densities fabricated by hybrid physical-chemical vapor deposition
• Effects of Neutron Irradiation on Carbon Doped MgB2 Wire Segments
• Experimental confirmation of the low B isotope coefficient in MgB2
• The influence of weak texture on the critical currents in polycrystalline MgB${}_2$
• Effect of Rb and Cs-doping on superconducting properties of MgB2 thin films
• Consequences of the peculiar intrinsic properties of MgB2 on its macroscopic current flow