Sutirtha Mukhopadhyay et al 2009 New J. Phys. 11 055002 doi:10.1088/1367-2630/11/5/055002
Magnetic impurities in the pnictide superconductor Ba1−xKxFe2As2
Iron-Based SuperconductorsSutirtha Mukhopadhyay1, Sangwon Oh1, A M Mounce1, Moohee Lee2, W P Halperin1,5, N Ni3, S L Bud'ko3, P C Canfield3, A P Reyes4 and P L Kuhns4
Show affiliationsPart of Iron-Based Superconductors
Nuclear magnetic resonance (NMR) measurements have been performed on single crystals of Ba1−xKxFe2As2 (x=0, 0.45) and CaFe2As2 grown from Sn flux. The Ba-based pnictide crystals contain significant amounts of Sn in their structure, ~1%, giving rise to magnetic impurity effects evident in the NMR spectrum and in the magnetization. Our experiments show that the large impurity magnetization is broadly distributed on a microscopic scale, generating substantial magnetic field gradients. There is a concomitant 20% reduction in the transition temperature, which is most likely due to magnetic electron scattering. We suggest that the relative robustness of superconductivity (x=0.45) in the presence of severe magnetic inhomogeneity might be accounted for by strong spatial correlations between impurities, such as clustering on the coherence length scale.
- PACS
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74.25.Nf Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.)
74.70.Dd Ternary, quaternary and multinary compounds (including Chevrel phases, borocarbides, etc.)
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- Dates
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Issue 5 (May 2009)
Received 19 February 2009
Published 5 May 2009
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Magnetic impurities in the pnictide superconductor Ba1−xKxFe2As2
Sutirtha Mukhopadhyay et al 2009 New J. Phys. 11 055002
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