Neutron Irradiation of Sm-1111

Abstract

SmFeAsO 1−x F x was irradiated in a fission reactor to a fast (E > 0.1 MeV) neutron fluence of 4 × 10 21 m −2 . The introduced defects increase the normal state resistivity due to a reduction in the mean free path of the charge carriers. This leads to an enhancement of the upper critical field at low temperatures. The critical current density within the grains, J c , increases upon irradiation.The second maximum in the field dependence of J c disappears and the critical current density becomes a monotonically decreasing function of the applied magnetic field.

Superconductivity in iron silicideLu2Fe3Si5probed by radiation-induced disordering

“…After irradiation the MgB 2 compound demonstrated a relatively weak change of the superconducting temperature T c , which is typical of the systems with a strong electronphonon interaction and isotropic s-type pairing [11,12,13]. In the Cu-based superconductors such as YBa 2 Cu 3 O 7 [13,14,15,16,17,18] as well as the FeAs-based superconductors [19,20,21], the fast and complete suppression of superconductivity under the high-energy particles irradiation evidences a more exotic (non-fononic) pairing mechanism.…”