Effect of neutron irradiation on the properties of FeSe compound in superconducting and normal states

Effect of atomic disordering induced by irradiation with fast neutrons on the properties of the normal and superconducting states of polycrystalline samples FeSe has been studied. The irradiation with fast neutrons of fluencies up to 1.25\cdot10^20 cm^-2 at the irradiation temperature Tirr ~ 50 \degree C results in relatively small changes in the temperature of the superconducting transition T_c and electrical resistivity Rho_25. Such a behavior is considered to be traceable to rather low, with respect to that possible at a given irradiation temperature, concentration of radiation defects, which is caused by a simpler crystal structure, considered to other layered compounds.