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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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Juraszek, Jean
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (18/18 displayed)
- 2023In-depth study of structural, magnetic and XPS behavior of the double perovskite La2-xCex/2Erx/2NiMnO6citations
- 2021Thermopower in the Ba 1−δ M 2+x Ru 4−x O 11 (M = Co, Mn, Fe) magnetic hexagonal ruthenates
- 2021Long-Range Cationic Order Collapse Triggered by S/Cl Mixed-Anion Occupancy Yields Enhanced Thermoelectric Properties in Cu5Sn2S7citations
- 2020Influence of the electronic polymorphism of Ni on the classification and design of high entropy alloyscitations
- 2020Structure and magnetic properties of epitaxial CaFe2O4 thin filmscitations
- 2020Interfacial Strain Gradients Control Nanoscale Domain Morphology in Epitaxial BiFeO 3 Multiferroic Filmscitations
- 2020Origin of the magnetic properties of Fe-implanted 4H-SiC semiconductorcitations
- 2020Non-auxetic/auxetic transitions inducing modifications of the magnetic anisotropy in CoFe2O4 thin filmscitations
- 2020A scalable synthesis route for multiscale defect engineering in the sustainable thermoelectric quaternary sulfide Cu26V2Sn6S32citations
- 2020Interfacial Strain Gradients Control Nanoscale Domain Morphology in Epitaxial BiFeO3 Multiferroic Filmscitations
- 2019Characterization of nanostructure in low dose Fe-implanted p-type 6H-SiC using atom probe tomographycitations
- 2019A magnetic phase diagram for nanoscale epitaxial BiFeO3 filmscitations
- 2019A magnetic phase diagram for nanoscale epitaxial BiFeO3 filmscitations
- 20186H-SiC-Fe Nanostructures Studied by Atom Probe Tomographycitations
- 2014Control of ferroelectricity and magnetism in multi-ferroic BiFeO3 by epitaxial straincitations
- 2013A Mössbauer investigation of the formation of the Ni3Fe phase by high energy ball milling and subsequent annealingcitations
- 2013A Mössbauer investigation of the formation of the Ni3Fe phase by high energy ball milling and subsequent annealingcitations
- 2004CEMS Investigations of Swift Heavy Ion Irradiation Effects in Tb/Fe Multilayerscitations
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article
Thermopower in the Ba 1−δ M 2+x Ru 4−x O 11 (M = Co, Mn, Fe) magnetic hexagonal ruthenates
Abstract
The magnetism, magnetotransport, and Seebeck coefficients (S) for three ruthenates Ba 1−δ M 2+x Ru 4−x O 11 (δ = 0.06; M = Mn, Co; x = 0.4) and Sr 1−δ M 2+x Ru 4−x O 11 (δ = 0.02; M = Fe; x = 0.7) compositions have been studied. Their crystallographic structures contain three metal sites, edge-sharing octahedra forming kagome lattices, face-shared octahedra with the shortest Ru(M)-Ru(M) distance, and MO 5 trigonal bipyramids. These three compositions have been selected for their transport behavior exhibiting small resistivity values (∼m cm) together with a complex ferrimagnetic behavior, with localization increasing from M = Co to M = Fe. This enabled the thermopower to be measured in hexagonal ruthenates in which the conducting kagome layers are more or less diluted by three different magnetic cations substituted for Ru. The positive Seebeck coefficient of the three compounds is found to increase up to 750 K to values in the range of 22 to 35 μV K-1. Such values, similar to those of perovskite ruthenates, reveal a Seebeck coefficient dominated by the Ru network at high temperature whatever the foreign magnetic cation is. In addition, below about 50 K, the values of S are very small for M = Mn and Co, and the S(T) curves of the Ba 1−δ M 2.4 Ru 3.6 O 11 compounds exhibit similarities with that of ruthenium metal. This is interpreted by shorter Ru-Ru distances as compared with perovskite ruthenates allowing a metallic direct exchange. The ferrimagnetism associated with the M cation does not seem to play a major role in transport, as there is almost no impact of the magnetic ordering on thermopower and electrical resistivity and the values of magnetoresistance remain very small, reaching at most −1% in 9 T at 5 K for M = Mn, and −0.4% at T C for M = Co. The present results obtained in these phases containing hexagonal Ru networks show that Hund's metal model developed to describe the thermopower of perovskite ruthenates with a Ru square lattice can have a broader range of validity.