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

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arxiv 0910.5198 v1 pith:ART3BHEN submitted 2009-10-27 cond-mat.supr-con

C. Tarantini , M. Putti , A. Gurevich , Y. Shen , R.K. Singh , J.M. Rowell , N. Newman , D.C. Larbalestier
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Peng Cheng Ying Jia Hai-Hu Wen
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classification cond-mat.supr-con
keywords irradiationabovealpha-particlecriticaldefectskondo-likendfeassingle
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abstract

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.

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