Abstract

We report the effect of α-particle irradiation on the reduction of the critical temperature Tc of a NdFeAs(OF) single crystal. Our data indicate that irradiation defects cause both nonmagnetic and magnetic scattering, resulting in the Kondo-like excess resistance Δρ(T) ln T over 2 decades in temperatures above Tc. The critical density of magnetic irradiation defects which suppresses Tc is found to be much higher than those for cuprates and multiband BCS superconductors. We suggest that such anomalously weak pair breaking by irradiation defects indicates that magnetic scattering in pnictides is coupled with pairing interactions mediated by spin fluctuations.

Original languageEnglish (US)
Article number087002
JournalPhysical Review Letters
Volume104
Issue number8
DOIs
StatePublished - Feb 24 2010

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critical temperature
retarding
irradiation
single crystals
defects
Group 5A compounds
scattering
cuprates
causes
interactions
temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Suppression of the critical temperature of superconducting NdFeAs(OF) single crystals by Kondo-like defect sites induced by α-particle irradiation. / Tarantini, C.; Putti, M.; Gurevich, A.; Shen, Y.; Singh, Rakesh; Rowell, J. M.; Newman, Nathan; Larbalestier, D. C.; Cheng, Peng; Jia, Ying; Wen, Hai Hu.

In: Physical Review Letters, Vol. 104, No. 8, 087002, 24.02.2010.

Research output: Contribution to journalArticle

Tarantini, C. ; Putti, M. ; Gurevich, A. ; Shen, Y. ; Singh, Rakesh ; Rowell, J. M. ; Newman, Nathan ; Larbalestier, D. C. ; Cheng, Peng ; Jia, Ying ; Wen, Hai Hu. / Suppression of the critical temperature of superconducting NdFeAs(OF) single crystals by Kondo-like defect sites induced by α-particle irradiation. In: Physical Review Letters. 2010 ; Vol. 104, No. 8.
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AU - Tarantini, C.

AU - Putti, M.

AU - Gurevich, A.

AU - Shen, Y.

AU - Singh, Rakesh

AU - Rowell, J. M.

AU - Newman, Nathan

AU - Larbalestier, D. C.

AU - Cheng, Peng

AU - Jia, Ying

AU - Wen, Hai Hu

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AB - We report the effect of α-particle irradiation on the reduction of the critical temperature Tc of a NdFeAs(OF) single crystal. Our data indicate that irradiation defects cause both nonmagnetic and magnetic scattering, resulting in the Kondo-like excess resistance Δρ(T) ln T over 2 decades in temperatures above Tc. The critical density of magnetic irradiation defects which suppresses Tc is found to be much higher than those for cuprates and multiband BCS superconductors. We suggest that such anomalously weak pair breaking by irradiation defects indicates that magnetic scattering in pnictides is coupled with pairing interactions mediated by spin fluctuations.

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