R. Mathieu
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View article: Magnetic properties of quenched binary and ternary quasicrystal approximants
Magnetic properties of quenched binary and ternary quasicrystal approximants Open
The magnetic properties of binary Gd-Cd and ternary Gd-Au-Ge crystals obtained from the newly introduced low-melt peritectic formation (LMPF) synthesis method were investigated. This method consists of a rapid quenching of the metallic mel…
View article: Traduire le texte sacré (en Chine)
Traduire le texte sacré (en Chine) Open
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View article: Structural and magnetic properties of the 1/1 Sm-Au-Al and Ho-Au-Al quasicrystal approximants
Structural and magnetic properties of the 1/1 Sm-Au-Al and Ho-Au-Al quasicrystal approximants Open
View article: Engineering hard ferrite composites by combining nanostructuring and Al3+ Substitution: From nano to dense bulk magnets
Engineering hard ferrite composites by combining nanostructuring and Al3+ Substitution: From nano to dense bulk magnets Open
View article: Non-exchange bias hysteresis loop shifts in dense composites of soft-hard magnetic nanoparticles: New possibilities for simple reference layers in magnetic devices
Non-exchange bias hysteresis loop shifts in dense composites of soft-hard magnetic nanoparticles: New possibilities for simple reference layers in magnetic devices Open
View article: Vibrational properties of monoclinic <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>CoTe</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>
Vibrational properties of monoclinic Open
The vibrational properties of monoclinic dirutile-type CoTeO4 (space group P21/c) were investigated by means of Raman and infrared (IR) spectroscopy on stoichiometric single crystals and theoretical density-functional theory (DFT) calculat…
View article: Electronic and magnetic structures of a mixed triple perovskite: <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">Ba</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">NiRuIrO</mml:mi><mml:mn>9</mml:mn></mml:msub></mml:math>
Electronic and magnetic structures of a mixed triple perovskite: Open
In search of spin-orbit coupling driven nonmagnetic J=0 ground state and excitonic magnetism, various pentavalent iridates have been studied in recent years. However, a finite moment was observed in most of the cases due to solid state eff…
View article: Single-crystal neutron diffraction study on the Ho13.6Au61.1Al25.3 quasicrystal approximant
Single-crystal neutron diffraction study on the Ho13.6Au61.1Al25.3 quasicrystal approximant Open
A single-crystal neutron diffraction study was conducted on a Ho13.6Au61.1Al25.3 Tsai-type quasicrystal approximant synthesised by the self-flux method. The magnetisation measurements reveal a ferrimagnetic behaviour with a transition belo…
View article: Magnetic frustration and glassiness in an icosahedral <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>i</mml:mi><mml:mtext>−</mml:mtext><mml:mi>Tb</mml:mi><mml:mtext>−</mml:mtext><mml:mi>Cd</mml:mi></mml:math> quasicrystal
Magnetic frustration and glassiness in an icosahedral quasicrystal Open
The dynamical magnetic properties of the icosahedral i−Tb−Cd quasicrystal (QC) were investigated by means of squid magnetometry. At low temperatures, below T∼4.5 K, we observe conventional spin glass features including aging, memory, and r…
View article: Magnetic property changes of NdGa upon hydrogen absorption
Magnetic property changes of NdGa upon hydrogen absorption Open
Rare earth monogallide (REGa) Zintl phases are attractive for their properties in hydrogen storage and magnetic cooling. However, the magnetic effects upon hydrogen additions in REGa are not well understood. This study aims to explore the …
View article: Phase Stability and Magnetic Properties of Compositionally Complex <i>n</i> = 2 Ruddlesden–Popper Perovskites
Phase Stability and Magnetic Properties of Compositionally Complex <i>n</i> = 2 Ruddlesden–Popper Perovskites Open
Four new compositionally complex perovskites with multiple (four or more) cations on the B site of the perovskites have been studied. The materials have the general formula La0.5Sr2.5(M)2O7-δ (M …
View article: Eu Doping in the GdCd<sub>7.88</sub> Quasicrystal and Its Approximant Crystal GdCd<sub>6</sub>
Eu Doping in the GdCd<sub>7.88</sub> Quasicrystal and Its Approximant Crystal GdCd<sub>6</sub> Open
The effect of Eu doping in the Tsai quasicrystal (QC) GdCd7.88 and its periodic 1/1 approximant crystal (AC) GdCd6 are investigated. This represents the first synthesis of Eu-containing stable QC samples, where three …
View article: Spin glass states in multicomponent layered perovskites
Spin glass states in multicomponent layered perovskites Open
View article: Non-Exchange Bias in Soft-Hard Nanoparticle Composites
Non-Exchange Bias in Soft-Hard Nanoparticle Composites Open
Exchange bias has been extensively studied both in exchange-coupled thin films and nanoparticle composite systems. However, the role of non -exchange mechanisms in the overall hysteresis loop bias are far from being understood. Here, dense…
View article: CoTeO<sub>4</sub> – a wide-bandgap material adopting the dirutile structure type
CoTeO<sub>4</sub> – a wide-bandgap material adopting the dirutile structure type Open
Dirutile-type CoTeO 4 exhibits a bandgap of ∼2.42 eV as determined by optical absorption spectroscopy.
View article: Chemical engineering of cationic distribution in spinel ferrite nanoparticles: the effect on the magnetic properties
Chemical engineering of cationic distribution in spinel ferrite nanoparticles: the effect on the magnetic properties Open
A set of ∼9 nm CoFe 2 O 4 nanoparticles substituted with Zn 2+ and Ni 2+ was prepared by thermal decomposition of metallic acetylacetonate precursors to correlate the effects of the replacement of Co 2+ with the resulting magnetic properti…
View article: Unraveling Exchange Coupling in Ferrites Nano‐Heterostructures
Unraveling Exchange Coupling in Ferrites Nano‐Heterostructures Open
The magnetic coupling of a set of SrFe 12 O 19 /CoFe 2 O 4 nanocomposites is investigated. Advanced electron microscopy evidences the structural coherence and texture at the interfaces of the nanostructures. The fraction of the lower aniso…
View article: Concentration and temperature dependence of the structural, magnetic, and dielectric properties of La2Ni(Mn1-xRux)O6 solid solutions
Concentration and temperature dependence of the structural, magnetic, and dielectric properties of La2Ni(Mn1-xRux)O6 solid solutions Open
The crystal structure, magnetic ordering, and dielectric characteristics of polycrystalline powder samples of La2NiMn1-xRuxO6 (x = 0.25-0.75) solid solutions have been studied. The X-ray diffraction results were analysed in detail, and rel…
View article: Non-Exchange Bias in Binary Nanoparticle Systems
Non-Exchange Bias in Binary Nanoparticle Systems Open
Exchange bias has been extensively studied both in exchange-coupled thin films and nanoparticle systems. However, the role of non-exchange mechanisms in the overall hysteresis loop bias are far from being understood. Here, dense soft-hard …
View article: Time and temperature dependent magnetic viscosity experiments on Sr/Co nanoferrite particles
Time and temperature dependent magnetic viscosity experiments on Sr/Co nanoferrite particles Open
Magnetic viscosity experiments have been performed in order to investigate the magnetization reversal in Sr nanoferrite particles (nanoscale SrFe12O19) and interacting Sr/Co nanoferrite particles (SrFe12O19–CoFe2O4 nanocomposites). The mag…
View article: CSD 2226560: Experimental Crystal Structure Determination
CSD 2226560: Experimental Crystal Structure Determination Open
An entry from the Inorganic Crystal Structure Database, the world’s repository for inorganic crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely availabl…
View article: CSD 2226561: Experimental Crystal Structure Determination
CSD 2226561: Experimental Crystal Structure Determination Open
An entry from the Inorganic Crystal Structure Database, the world’s repository for inorganic crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely availabl…
View article: The Cobalt(II) Oxidotellurate(IV) Hydroxides Co2(TeO3)(OH)2 and Co15(TeO3)14(OH)2
The Cobalt(II) Oxidotellurate(IV) Hydroxides Co2(TeO3)(OH)2 and Co15(TeO3)14(OH)2 Open
Previously unknown Co2(TeO3)(OH)2 and Co15(TeO3)14(OH)2 were obtained under mild hydrothermal reaction conditions (210 °C, autogenous pressure) from alkaline solutions. Their crystal structures were determined from single-crystal X-ray dif…
View article: Tunable particle-agglomeration and magnetic coupling in bi-magnetic nanocomposites
Tunable particle-agglomeration and magnetic coupling in bi-magnetic nanocomposites Open
We propose an efficient way to synthesize strongly magnetically coupled nanocomposites, where the final extrinsic properties could be tuned by controlling the agglomeration of Co–Zn-ferrite nanoparticles in the Sr ferrite matrix and their …
View article: Effect of pseudo-Tsai cluster incorporation on the magnetic structures of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>R</mml:mi><mml:mtext>−</mml:mtext><mml:mi>Au</mml:mi><mml:mtext>−</mml:mtext><mml:mi>Si</mml:mi></mml:mrow><mml:mo> </mml:mo><mml:mrow><mml:mo>(</mml:mo><mml:mi>R</mml:mi><mml:mo>=</mml:mo><mml:mi>Tb</mml:mi><mml:mo>,</mml:mo><mml:mi>Ho</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:math> quasicrystal approximants
Effect of pseudo-Tsai cluster incorporation on the magnetic structures of quasicrystal approximants Open
In cluster-based quasicrystals, tetrahedra located in conventional Tsai clusters may be replaced by single rare-earth (R) ions at the cluster centers (pseudo-Tsai clusters). In this study, we investigate the effect of the pseudo-Tsai clust…
View article: Examination of the critical behavior and magnetocaloric effect of the ferromagnetic Gd-Au-Si quasicrystal approximants
Examination of the critical behavior and magnetocaloric effect of the ferromagnetic Gd-Au-Si quasicrystal approximants Open
We investigate the critical behavior and magnetocaloric effects of the Gd-Au-Si (GAS) ferromagnetic quasicrystal approximants, Gd13.7Au72.7Si13.6 [referred to as GAS(0)] and Gd15.4Au68.6Si16.0 [GAS(100)]. The former is a conventional Tsai-…
View article: CSD 2103496: Experimental Crystal Structure Determination
CSD 2103496: Experimental Crystal Structure Determination Open
An entry from the Inorganic Crystal Structure Database, the world’s repository for inorganic crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely availabl…
View article: 2D crystal structure and anisotropic magnetism of GdAu6.75−xAl0.5+x (x ≈ 0.54)
2D crystal structure and anisotropic magnetism of GdAu6.75−xAl0.5+x (x ≈ 0.54) Open
View article: Crossover From Individual to Collective Magnetism in Dense Nanoparticle Systems: Local Anisotropy Versus Dipolar Interactions
Crossover From Individual to Collective Magnetism in Dense Nanoparticle Systems: Local Anisotropy Versus Dipolar Interactions Open
Dense systems of magnetic nanoparticles may exhibit dipolar collective behavior. However, two fundamental questions remain unsolved: i) whether the transition temperature may be affected by the particle anisotropy or it is essentially dete…
View article: Nonequilibrium dynamical behavior in noncoplanar magnets with chiral spin texture
Nonequilibrium dynamical behavior in noncoplanar magnets with chiral spin texture Open
We observe nonequilibrium dynamical magnetic behavior in the magnetically ordered phase of a Tsai-type Tb-Au-Si quasicrystal approximant system. The magnetic texture in the ordered phase is found to exhibit scalar spin chirality (SSC) orde…