| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Schultz, Ludwig
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (31/31 displayed)
- 2017Micromagnetic investigation of domain and domain wall evolution through the spin-reorientation transition of an epitaxial NdCo5 film
- 2016Ti/Al multi-layered sheets: Differential speed rolling (Part B)citations
- 2016Large pinning forces and matching effects in YBa2Cu3O7-δ thin films with Ba2Y(Nb/Ta)O6 nano-precipitates
- 2016Electron beam induced dehydrogenation of MgH 2 studied by VEELS
- 2016Electron beam induced dehydrogenation of MgH2 studied by VEELS
- 2016Structural and ferroelectric properties of 0.9PMN-0.1PT thin filmscitations
- 2016Designing new biocompatible glass-forming Ti₇₅ˍₓ Zr₁₀ Nbₓ Si₁₅ (x = 0, 15) alloys : corrosion, passivity, and apatite formationcitations
- 2015BaHfO3 artificial pinning centres in TFA-MOD-derived YBCO and GdBCO thin filmscitations
- 2015Influence of substrate type on transport properties of superconducting FeSe 0.5 Te 0.5 thin filmscitations
- 2015High field superconducting properties of Ba(Fe1-xCox)2As2 thin films
- 2014Improved REBa₂Cu₃O₇₋ₓ (RE ═ Y, Gd) structure and superconducting properties by addition of acetylacetone in TFA-MOD precursor solutionscitations
- 2014Magnetization dynamics of magnetic domain wall imprinted magnetic filmscitations
- 2014The Strengthening Effect of Phase Boundaries in a Severely Plastically Deformed Ti-Al Composite Wirecitations
- 2013Annealing control of magnetic anisotropy and phase separation in CoFe2O4-BaTiO3 nanocomposite filmscitations
- 2013Grain refinement and deformation mechanisms in room temperature severe plastic deformed Mg-AZ31citations
- 2013Twinning phenomena along and beyond the bain pathcitations
- 2013Production of porous β-Type Ti–40Nb alloy for biomedical applications: Comparison of selective laser melting and hot pressingcitations
- 2013Processing of intermetallic titanium aluminide wirescitations
- 2012Understanding the magnetic shape memory system Fe-Pd-X by thin film experiments and first principle calculationscitations
- 2012Enhancing magnetocrystalline anisotropy of the Fe70Pd30 magnetic shape memory alloy by adding Cucitations
- 2012Magnetic domains and twin boundary movement of NiMnGa magnetic shape memory crystalscitations
- 2011As-vacancies, local moments, and Pauli limiting in LaO_0.9F_0.1FeAs_(1-delta) superconductorscitations
- 2011Ti-Al composite wires with high specific strengthcitations
- 2011Enhanced nucleation of vortices in soft magnetic materials prepared by silica nanosphere lithographycitations
- 2010Correlation of phase transformations and magnetic properties in annealed epitaxial Fe--Pd magnetic shape memory alloy films
- 2010Volume magnetic domain mirroring in magnetic shape memory crystalscitations
- 2010Investigating the Outskirts of Fe and Co Catalyst Particles in Alumina-Supported Catalytic CVD Carbon Nanotube Growthcitations
- 2010Magnetoelectrochemical surface structuringcitations
- 2010Electrocrystallisation of CoFe alloys under the influence of external homogeneous magnetic fields-Properties of deposited thin filmscitations
- 2009Local stress engineering of magnetic anisotropy in soft magnetic thin filmscitations
- 2005Magnetic anisotropy and domain patterning of amorphous films by He-ion irradiationcitations
Places of action
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document
As-vacancies, local moments, and Pauli limiting in LaO_0.9F_0.1FeAs_(1-delta) superconductors
Abstract
We report magnetization measurements of As-deficient LaO_0.9F_0.1FeAs_1-delta (delta about 0.06) samples with improved superconducting properties as compared with As-stoichiometric optimally doped La-1111 samples. In this As-deficient system with almost homogeneously distributed As-vacancies (AV), as suggested by the (75)As-nuclear quadrupole resonance (NQR) measurements,we observe a strong enhancement of the spin-susceptibility by a factor of 3-7. This observation is attributed to the presence of an electronically localized state around each AV, carrying a magnetic moment of about 3.2 mu_Bohr per AV or 0.8 mu_Bohr/Fe atom. From theoretical considerations we find that the formation of a local moment on neighboring iron sites of an AV sets in when the local Coulomb interaction exceeds a critical value of about 1.0 eV in the dilute limit. Its estimated value amounts to ~ 2.5 eV and implies an upper bound of ~ 2 eV for the Coulomb repulsion at Fe sites beyond the first neighbor-shell of an AV. Electronic correlations are thus moderate/weak in doped La-1111. The strongly enhanced spin susceptibility is responsible for the Pauli limiting behavior of the superconductivity that we observe in As-deficient LaO_0.9F_0.1FeAs_1-delta. In contrast, no Pauli limiting behavior is found for the optimally doped, As-stoichiometric LaO_0.9F_0.1FeAs superconductor in accord with its low spin susceptibility. ; Comment: 11 pages, 9 figures