Electrical transport properties of Mn-doped LaFeAsO oxypnictide

We report on the electrical transport properties of the Mn-doped LaFe 1− x Mn x AsO oxypnictide system. We show that the substitution of iron by manganese in the FeAs layer leads to a gradual expansion of the lattice parameters and of the Fe–As and Fe–Fe bond lengths, as well as a change in the angl...

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Bibliographic Details
Published in:Journal of alloys and compounds 2009-07, Vol.481 (1), p.470-472
Main Authors: Bérardan, David, Pinsard-Gaudart, Loreynne, Dragoe, Nita
Format: Article
Language:English
Subjects:
Bonding
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Doping
Electrical transport
Exact sciences and technology
Finite element method
High Tc-superconductors
Iron
Iron based superconductors
Manganese
Physics
Properties of type I and type II superconductors
Spin density waves
Superconductivity
Transport properties
Transport properties (electric and thermal conductivity, thermoelectric effects, etc.)
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Summary:We report on the electrical transport properties of the Mn-doped LaFe 1− x Mn x AsO oxypnictide system. We show that the substitution of iron by manganese in the FeAs layer leads to a gradual expansion of the lattice parameters and of the Fe–As and Fe–Fe bond lengths, as well as a change in the angles of the FeAs 4 tetrahedron which becomes more regular. The structural transition from tetragonal to orthorhombic coupled to the emergence of a spin density wave is rapidly suppressed by Mn doping. Interestingly, Mn doping does not lead to p-type behaviour. Moreover, no superconducting transition is observed, and the system evidences a metal–semiconductor transition around x = 0.03. Thus, there is apparently no symmetric behaviour of the manganese doping and cobalt doping in the FeAs layer of the LaFeAsO system.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2009.02.143