Search results for "Iron based"

showing 3 items of 3 documents

Temperature and doping dependence of normal state spectral properties in a two-orbital model for ferropnictides

2016

Using a second-order perturbative Green's functions approach we determined the normal state single-particle spectral function $A(\vec{k},\omega)$ employing a minimal effective model for iron-based superconductors. The microscopic model, used before to study magnetic fluctuations and superconducting properties, includes the two effective tight-binding bands proposed by S.Raghu et al. [Phys. Rev. B 77, 220503 (R) (2008)], and intra- and inter-orbital local electronic correlations, related to the Fe-3d orbitals. Here, we focus on the study of normal state electronic properties, in particular the temperature and doping dependence of the total density of states, $A(\omega)$, and of $A(\vec{k},\o…

ELECTRONIC PROPERTIESCiencias FísicasARPES; Correlated electron systems; Electronic properties; Green's functions; Iron based superconductors; Normal state spectral properties; Physics and Astronomy (all)Iron based superconductorsFOS: Physical sciencesGeneral Physics and AstronomyAngle-resolved photoemission spectroscopy02 engineering and technologyElectronCorrelated electron systems01 natural sciencesSuperconductivity (cond-mat.supr-con)RenormalizationPhysics and Astronomy (all)Condensed Matter - Strongly Correlated Electronssymbols.namesakeAtomic orbitalGREEN'S FUNCTIONS0103 physical sciencesGreen's functions010306 general physicsSuperconductivityPhysicsStrongly Correlated Electrons (cond-mat.str-el)Condensed matter physicsIRON BASED SUPERCONDUCTORSCondensed Matter - SuperconductivityFermi levelARPES021001 nanoscience & nanotechnologyAstronomíaBrillouin zoneElectronic propertiesNORMAL STATE SPECTRAL PROPERTIESDensity of statessymbolsNormal state spectral propertiesCORRELATED ELECTRON SYSTEMS0210 nano-technologyCIENCIAS NATURALES Y EXACTASPhysics Letters A
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Magnetic Lifshitz transition and its consequences in multi-band iron-based superconductors

2017

In this paper we address Lifshitz transition induced by applied external magnetic field in a case of iron-based superconductors, in which a difference between the Fermi level and the edges of the bands is relatively small. We introduce and investigate a two-band model with intra-band pairing in the relevant parameters regime to address a generic behaviour of a system with hole-like and electron-like bands in external magnetic field. Our results show that two Lifshitz transitions can develop in analysed systems and the first one occurs in the superconducting phase and takes place at approximately constant magnetic field. The chosen sets of the model parameters can describe characteristic ban…

SuperconductivityPhysicsMultidisciplinaryStrongly Correlated Electrons (cond-mat.str-el)Condensed matter physicsCondensed Matter - SuperconductivityFermi levelPhase (waves)FOS: Physical sciences02 engineering and technology021001 nanoscience & nanotechnology01 natural sciencesArticleMagnetic fieldSuperconductivity (cond-mat.supr-con)Condensed Matter - Strongly Correlated Electronssymbols.namesakeIron basedPairing0103 physical sciencessymbols010306 general physics0210 nano-technologyConstant (mathematics)Electronic band structureScientific Reports
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Protection of iron-based alloys likely to be exposed to corrosive atmospheres

1998

Summary This study examines the influence of temperature on oxidation kinetics of the alloys Z2CT 17 and Z4CN 18-09. A thin layer of aluminium oxide was laid down on these, using chemical, vapor deposition, in order to give improved protection.

chemistry.chemical_compoundMaterials sciencechemistryIron basedKineticsThin layerMetallurgyMaterials ChemistryAluminium oxideChemical vapor depositionAnnales de Chimie Science des Mat�riaux
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