Determination of the phase diagram of the electron-doped superconductor Ba (Fe1-x Cox)2 As2

Physical Review B - Condensed Matter and Materials Physics

Volumn 79, Issue 1, 2009, Pages

  Chu, Jiun Haw ^a   Analytis, James G ^a   Kucharczyk, Chris ^a   Fisher, Ian R ^a  

^a STANFORD UNIVERSITY   (United States)

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Indexed keywords

EID: 59249093376     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.79.014506     Document Type: Article

References (20)

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9. Absolute values of ρab (300 K) for three representative Co concentrations are 0.676 mΩcm (x=0, undoped), 0.906 mΩcm (x=0.061, optimally doped), and 0.696 mΩcm (x=0.18, completely overdoped).
10. The origin of the significant difference between the resistivity anomaly associated with the structural/magnetic transitions in undoped BaFe2 As2 and Co-doped BaFe2 As2 is unclear. Recent optical conductivity measurements indicate that a substantial fraction of the FS of BaFe2 As2 is gapped below the SDW transition (Ref.). In this case, we can speculate that there is a subtle balance between effects associated with the reduction in the number of carriers and changes in the scattering. We note that the resistivity anomaly associated with the magnetic/structural phase transitions observed for intermediate Co concentrations is reminiscent of that which is observed for BaFe2 As2 grown from a Sn flux (Ref.), possibly indicating that Sn substitution also affects the scattering in a similarly sensitive manner.
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