| 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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Christensen, Dennis Valbjørn
Technical University of Denmark
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (15/15 displayed)
- 2023Perspectives on oxide heterostructures – the curious case of γ-Al 2 O 3 /SrTiO 3citations
- 2023Reconstruction of Low Dimensional Electronic States by Altering the Chemical Arrangement at the SrTiO3 Surfacecitations
- 2023Perspectives on oxide heterostructures – the curious case of γ-Al2O3/SrTiO3citations
- 2022On the thermoelectric properties of Nb-doped SrTiO 3 epitaxial thin filmscitations
- 2022Freestanding Perovskite Oxide Filmscitations
- 2019Electrical, magnetic and magnetotransport properties of Na and Mo doped Ca3Co4O9 materialscitations
- 2019Electrical, magnetic and magnetotransport properties of Na and Mo doped Ca 3 Co 4 O 9 materialscitations
- 2019Diluted Oxide Interfaces with Tunable Ground Statescitations
- 2018Exploring magnetic and electronic properties in γ-Al2O3/SrTiO3
- 2018Exploring magnetic and electronic properties in γ-Al 2 O 3 /SrTiO 3
- 2018High-temperature thermoelectric properties of Na- and W-Doped Ca3Co4O9 system citations
- 2017Microscopic origin of the mobility enhancement at a spinel/perovskite oxide heterointerface revealed by photoemission spectroscopycitations
- 2016Scandium-doped zinc cadmium oxide as a new stable n-type oxide thermoelectric materialcitations
- 2012On the origin of metallic conductivity at the interface of LaAlO3/SrTiO3citations
- 2012Resistance switching of the interfacial conductance in amorphous SrTiO3 heterostructures
Places of action
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article
Electrical, magnetic and magnetotransport properties of Na and Mo doped Ca3Co4O9 materials
Abstract
We report the electrical, magnetic and magnetotransport properties of Na and Mo dual doped Ca<sub>3-2x</sub>Na<sub>2x</sub>Co<sub>4-x</sub>Mo<sub>x</sub>O<sub>9</sub> (0 ≤ x ≤ 0.15) polycrystalline samples. The results indicate that the strength of ferrimagnetic interaction decreases with increase in doping, as is evident from the observed decrease in Curie temperatures (TC). The substitution of non-magnetic Mo<sup>6+</sup> ions (4d<sup>0</sup>) in CoO<sub>2</sub> layers and the presence of oxygen vacancies are responsible for decrease in ligand field strength, which results in an enhanced magnetization in the low doped x = 0.025 sample due to a change from the low spin to partial high spin electron configuration. The electrical resistivity of samples exhibits a semiconducting-like behavior in the low temperature range, a strongly correlated Fermi liquid-like behavior in the intermediate temperature range, and an incoherent metal-like behavior in the temperature range 210-300 K. All the samples show a large negative magnetoresistance (MR) at low temperature with a maximum MR value of -59% for the x = 0.025 sample at 2 K and 16 T applied field. The MR values follow the observed trend in magnetization at 5 K and sharply increase below the Curie temperatures of the samples, suggesting that the ferrimagnetic interactions are mainly responsible for the decrease in electrical resistivity under an applied magnetic field.