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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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Smetana, V.
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Topics
Publications (9/9 displayed)
- 2022Four ternary silicides in the La-Ni-Si system: from polyanionic layers to frameworkscitations
- 2021Crystal and electronic structures of the new ternary silicide Sc12Co41.8Si30.2citations
- 2021Investigation in the ternary Ta-Ni-P systemcitations
- 2020Metamagnetic transition, magnetocaloric effect and electronic structure of the rare-earth anti-perovskite SnOEu3citations
- 2020Magnetic phase transitions in Eu(Co1-x Nix)2-y As2 single crystalscitations
- 2020Ferromagnetic cluster-glass phase in Ca(Co1-xIrx)2-yAs2 crystalscitations
- 2019Helical antiferromagnetic ordering in EuNi1.95As2 single crystalscitations
- 2019Non-Fermi-liquid types of behavior associated with a magnetic quantum critical point in Sr(Co1-xNix)2As2 single crystalscitations
- 2018Enhanced moments of Eu in single crystals of the metallic helical antiferromagnet EuCo2-yAs2citations
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article
Magnetic phase transitions in Eu(Co1-x Nix)2-y As2 single crystals
Abstract
<p>The effects of Ni doping in Eu(Co1-xNix)2-yAs2 single crystals with x=0 to 1 grown out of self-flux are investigated via crystallographic, electronic transport, magnetic, and thermal measurements. All compositions adopt the body-centered-tetragonal ThCr2Si2 structure with space group I4/mmm. We also find 3%-4% of randomly distributed vacancies on the Co/Ni site. Anisotropic magnetic susceptibility χα(α=ab,c) data versus temperature T show clear signatures of an antiferromagnetic (AFM) c-axis helix structure associated with the Eu+2 spins 72 for x=0 and 1 as previously reported. The χα(T) data for x=0.03 and 0.10 suggest an anomalous 2q magnetic structure containing two helix axes along the c axis and in the ab plane, respectively, whereas for x=0.75 and 0.82 a c-axis helix is inferred as previously found for x= 0 and 1. At intermediate compositions x=0.2, 0.32, 0.42, 0.54, and 0.65, a magnetic structure with a large ferromagnetic (FM) c-axis component is found from magnetization versus field isotherms, suggested to be an incommensurate FM c-axis cone structure associated with the Eu spins, which consists of both AFM and FM components. In addition, the χ(T) and heat capacity Cp(T) data for x=0.2-0.65 indicate the occurrence of itinerant FM order associated with the Co/Ni atoms with Curie temperatures from 60 to 25 K, respectively. Electrical resistivity ρ(T) measurements indicate metallic character for all compositions with abrupt increases in slope on cooling below the Eu AFM transition temperatures. In addition to this panoply of magnetic transitions, Eu151 Mössbauer measurements indicate that ordering of the Eu moments proceeds via an incommensurate sine amplitude-modulated structure with additional transition temperatures associated with this effect.</p>