Suppression of the critical temperature of superconducting NdFeAs(OF) single crystals by Kondo-like defect sites induced by alpha-particle irradiation

Authors
Tarantini, C.
Putti, M.
Gurevich, A.
Shen, Y.
Singh, R. K.
Rowell, J. M.
Newman, N.
Larbalestier, D. C.
Cheng, Peng
Jia, Ying
Description
We report a comprehensive investigation of the suppression of the critical temperature Tc of NdFeAs(OF) single crystal by alpha-particle irradiation. Our data indicate that irradiation defects produce both nonmagnetic and magnetic scattering, resulting in the Kondo-like excess resistance $\Delta\rho(T)\propto ln T$ over 2 decades in temperatures above $T_c$. Despite high densities of irradiation defects, the dose at which $T_c$ is suppressed to zero is comparable to that for MgB2 but is well above the corresponding values for cuprates.
Comment: 11 pages, 4 figures
Keywords
Condensed Matter - Superconductivity