Isoelectronic Ru substitution at the iron site inSmFe1−xRuxAsO0.85F0.15and its effects on structural, superconducting, and normal-state properties

2010/04/12 by M. Tropeano, M. R. Cimberle, C. Ferdeghini +12 · 4 citations
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paper · pdf · doi:10.1103/physrevb.81.184504

published as Physical Review B 81, 184504 (2010) · Accepted on Physical Review B

arxiv created 2010/04/12 · openalex publication_date 2010/05/10 · arxiv updated 2015/05/18 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

In this work we present a systematic experimental and theoretical study of the structural, transport, and superconducting properties of Sm(Fe_1\ensuremath-xRu_x)As(O_0.85F_0.15) polycrystalline samples as a function of Ru content (x) ranging from 0 to 1. The choice of Ru as isoelectronic substitution at Fe site of F-doped compounds allows to better clarify the role of structural disorder in modifying the normal and superconducting properties of these recently discovered multiband superconductors. Two different regions are identified: the Fe-rich phase (x<0.5) where superconducting and normal-state properties are strongly affected by disorder induced by Ru substitution; the Ru-rich phase (x>0.5) where the system is metallic and strongly compensated and the presence of Ru frustrates the magnetic moment on Fe ions. Here the lack of magnetic features and related spin fluctuations may be the cause for the suppression of superconductivity.

Citations

• Problems with reconciling density functional theory calculations with experiment in ferropnictides
• Superconductivity inLaFe1−xCoxAsO
• Projector augmented-wave method
• A key role for unusual spin dynamics in ferropnictides
• Recent advances in magnetic structure determination by neutron powder diffraction
• Superconductivity at 25 K in hole-doped (La 1-x Sr x )OFeAs
• Synthesis, crystal structure, microstructure, transport and magnetic properties of SmFeAsO and SmFeAs(O0.93F0.07)
• Electronic structure ofBa(Fe,Ru)2As2andSr(Fe,Ir)2As2alloys
• Self-interaction correction to density-functional approximations for many-electron systems
• Ab initiomolecular dynamics for liquid metals
• Superconductivity in Ru-substituted polycrystallineBaFe2−xRuxAs2
• Origin of the 150-K Anomaly in LaFeAsO: Competing Antiferromagnetic Interactions, Frustration, and a Structural Phase Transition
• Electronic structure of solids

Cited by

• Evidence of a multiple boson emission in Sm 1−x Th x OFeAs
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• Thermoelectric properties of iron-based superconductors and parent compounds
• Spin polarization of Ru in superconducting Ba(Fe0.795Ru0.205)2As2studied by x-ray resonant magnetic scattering