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

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

2004-11-15

arxiv.org/abs/cond-mat/0411383v1

Appl. Phys. Lett. 86 (2005) 112503

Physics

Condensed Matter

Superconductivity

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

Scientific paper

10.1063/1.1880450

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.

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