| 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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Meven, Martin
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (19/19 displayed)
- 2024Topological aspects of multi-k antiferromagnetism in cubic rare-earth compoundscitations
- 2024Topological aspects of multi-$bm{k}$ antiferromagnetism in cubic rare-earth compoundscitations
- 2024Long-range magnetic order in CePdAl3 enabled by orthorhombic deformation
- 2023Magnetic structure of the two-dimensional XY antiferromagnet Sr 2 CoSi 2 O 7 studied using single-crystal neutron diffractioncitations
- 2023Magnetic structure of the two-dimensional XY antiferromagnet Sr2CoSi2O7 studied using single-crystal neutron diffractioncitations
- 2021Infrared furnace for in situ neutron single-crystal diffraction studies in controlled gas atmospheres at high temperaturescitations
- 2021Interdependent scaling of long-range oxygen and magnetic ordering in nonstoichiometric Nd$_2$NiO$_{4.10}$citations
- 2019Structural disorder and magnetic correlations driven by oxygen doping in Nd_{2}NiO_{4+δ} ( δ ∼ 0.11 )citations
- 2019H-bonding in lazulite: a single-crystal neutron diffraction study at 298 and 3 K
- 2019Unambiguous determination of the commensurate antiferromagnetic structure of HoNi 2 B 2 C in the superconducting ground statecitations
- 2018(Nd/Pr)2NiO4+δ: reaction intermediates and redox behavior explored by in situ neutron powder diffraction during electrochemical oxygen intercalationcitations
- 2018Proton disorder in a short intramolecular hydrogen bond investigated by single-crystal neutron diffraction at 2.5 and 170 Kcitations
- 2018Crystal Structure of Magnetoelectric Ba$_2$MnGe$_2$O$_7$ at Room and Low Temperatures by Neutron Diffractioncitations
- 2016Single-crystal neutron diffraction on γ-LiAlO2: structure determination and estimation of lithium diffusion pathway
- 2016The low-temperature crystal structure of the multiferroic melilite Ca2CoSi2O7citations
- 2016H-bonding scheme and cation partitioning in axinite: a single-crystal neutron diffraction and Mössbauer spectroscopic studycitations
- 2015Solid-state reactivity explored in situ by synchrotron radiation on single crystals: from SrFeO 2.5 to SrFeO 3 via electrochemical oxygen intercalationcitations
- 2015Solid-state reactivity explored in situ by synchrotron radiation on single crystals: from SrFeO2.5 to SrFeO3 via electrochemical oxygen intercalationcitations
- 2015Single-crystal neutron diffraction and Mössbauer spectroscopic study of hureaulite, (Mn,Fe)$_5$(PO$_4$)$_2$(HPO$_4$)$_2$(H$_2$O)$_4$citations
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article
Structural disorder and magnetic correlations driven by oxygen doping in Nd_{2}NiO_{4+δ} ( δ ∼ 0.11 )
Abstract
We investigated the influence of oxygen overstoichiometry on apical oxygen disorder and magnetic correlations in Nd2NiO4+δ (δ ∼ 0.11) in the temperature range of 2–300 K by means of synchrotron x-ray powder diffraction, neutron single-crystal and powder diffraction studies, combined with macroscopic magnetic measurements. In the investigated temperature range, the compound crystallizes in a tetragonal commensurate structure with a P42/ncm space group with excess oxygen atoms occupying the 4b (¾ ¼ ¼) interstitial sites, coordinated by four apical oxygen atoms. Large and anisotropic thermal displacement parameters are found for equatorial and apical oxygen atoms, which are strongly reduced on an absolute scale compared to the Nd2NiO4.23 phase. Maximum entropy analysis of the neutron single-crystal diffraction data uncovered anharmonic contributions to the displacement parameters of the apical oxygen atoms, toward the nearest vacant 4b interstitial site, related to the phonon-assisted oxygen diffusion mechanism. Macroscopic magnetization measurements and neutron powder diffraction studies reveal long-range antiferromagnetic ordering of the Ni sublattice at TN ∼ 53K with a weak ferromagnetic component along the c axis, while the long-range magnetic ordering of the Nd sublattice occurs below 10 K. Temperature-dependent neutron diffraction patterns show the appearance of a commensurate magnetic order at TN with the propagation vector k = (100) and the emergence of an additional incommensurate phase below 30 K, while both phases coexist at 2 K. The commensurate magnetic structure is best described by the P42/ncm Shubnikov space group. Refined magnetic moments of the Ni and Nd sites at 2 K are 1.144(76) and 1.632(52)μB, respectively. A possible origin of the incommensurate phase is discussed and a tentative magnetic phase diagram is proposed.