Evidence of local disorder in the overdoped regime of Ba(Fe 1-xCox)2As2

Keeseong Park, Despina Louca, Anna Llobet, J. Q. Yan

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Abstract

The appearance of superconductivity in the antiferromagnet of BaFe 2As2 with Co doping coincides with a phase transition from an orthorhombic to a tetragonal structure where coexistence of the two is observed near the phase boundary. Overdoping brings suppression of TC near x=0.12 that is not accompanied by a transition back to the orthorhombic phase. Using pulsed neutron powder diffraction, the relation of superconductivity to the atomic structure in the overdoped regime has been investigated. The suppression of superconductivity is accompanied by a structural local distortion around Co. The distortion, described as a breathing mode with alternating two or four Fe ions displaced toward Co in the ab plane, sets in above TC and remains in place below.

Original languageEnglish
Article number024512
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number2
DOIs
StatePublished - Jul 12 2011

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