1. Neutron irradiation of MgB211: From the enhancement to the suppression of superconducting properties
- Author
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M. Putti, V. Braccini, C. Ferdeghini, F. Gatti, G. Grasso, P. Manfrinetti, D. Marré, A. Palenzona, I. Pallecchi, C. Tarantini, I. Sheikin, H. U. Aebersold, and E. Lehmann
- Subjects
Superconductivity ,Materials science ,Physics and Astronomy (miscellaneous) ,Isotope ,Field (physics) ,Condensed matter physics ,Physics::Instrumentation and Detectors ,Condensed Matter::Superconductivity ,Bulk samples ,Physics::Medical Physics ,Neutron ,Neutron irradiation ,Critical field - 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.
- Published
- 2005
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