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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.
in Cooperation with on an Cooperation-Score of 37%
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
Helical antiferromagnetic ordering in EuNi1.95As2 single crystals
Abstract
<p>The Eu+2 spins-7/2 in EuNi2As2 with the body-centered tetragonal ThCr2Si2 structure order antiferromagnetically below the Néel temperature TN=15 K into a helical antiferromagnetic (AFM) structure with the helix axis aligned along the tetragonal c axis and the Eu ordered moments aligned ferromagnetically within the ab plane as previously reported from neutron diffraction measurements [T. Jin, Phys. Rev. B 99, 014425 (2019)2469-995010.1103/PhysRevB.99.014425]. Here we study the crystallographic, magnetic, thermal, and electronic transport properties of Bi-flux-grown single crystals using single-crystal x-ray diffraction, anisotropic magnetic susceptibility χ, isothermal magnetization M, heat capacity Cp, and electrical resistivity ρ measurements versus applied magnetic field H and temperature T. Vacancies are found on the Ni sites corresponding to the composition EuNi1.95(1)As2. A good fit of the ρ(T) data by the Bloch-Grüneisen theory for metals was obtained. The χab(T) data below TN are fitted well by molecular field theory (MFT), and the helix turn angle kd and the Eu-Eu Heisenberg exchange constants are extracted from the fit parameters. The kd value is in good agreement with the neutron-diffraction result. The magnetic contribution to the zero-field heat capacity below TN is also fitted by MFT. The isothermal in-plane magnetization Mab exhibits two metamagnetic transitions versus H, whereas Mc(T=2K) is nearly linear up to H=14 T, both behaviors being consistent with MFT. The Mc(H,T),ρ(Hc,T), and Cp(Hc,T) data yielded a Hc-T phase diagram separating the AFM and paramagnetic phases in good agreement with MFT. Anisotropic χ(T) literature data for the ThCr2Si2-type helical antiferromagnet EuRh2As2 were also fitted well by MFT. A comparison is made between the crystallographic and magnetic properties of ThCr2Si2-type EuM2Pn2 compounds with M=Fe, Co, Ni, Cu, or Rh, and Pn=P or As, where only ferromagnetic and c-axis helical AFM structures are found.</p>