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Article
Open AccessMagnetic anisotropy, unusual hysteresis and putative “up-up-down” magnetic structure in EuTAl4Si2 (T = Rh and Ir)
We present detailed investigations on single crystals of quaternary EuRhAl4Si2 and EuIrAl4Si2. The two compounds order antiferromagnetically at TN1 = 11.7 and 14.7 K, respectively, each undergoing two magnetic tr...
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Chapter and Conference Paper
Mössbauer study of magnetism in FeII − III (oxy-)hydroxycarbonate green rusts; ferrimagnetism of FeII − III hydroxycarbonate
FeII − III hydroxycarbonate Fe \(^{\rm II}_{4}\) Fe \(^{\rm III}_{2}\) ...
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Article
Mössbauer study of magnetism in FeII − III (oxy-)hydroxycarbonate green rusts; ferrimagnetism of FeII − III hydroxycarbonate
FeII − III hydroxycarbonate Fe \(^{\rm II}_{4}\) Fe ...
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Article
Phase transition in YbAl3C3
170Yb Mössbauer spectroscopy, temperature dependent X-ray, magnetisation and specific heat data are presented in the hexagonal intermetallic YbAl3C3, in order to shed light on the isostructural...
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Article
Magnetic properties of YbNi5 from 170Yb Mössbauer and magnetisation measurements
From Yb170 Mössbauer measurements on YbNi5, we establish: the Yb3+ ground state Kramers doublet is well isolated and has uniaxial anisotropy, the compound magnetically orders at 0.55 K, the Yb3+ moments are ali...
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Article
Large influence of the synthesis conditions on the physico-chemical properties of nanostructured Fe3O4
Magnetite synthesized via three different synthesis routes (coprecipitation process in aqueous media, electrochemical synthesis in presence of complexing agents and solid state reaction at high temperature) ha...
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Article
Spectroscopic description of an unusual protonated ferryl species in the catalase from Proteus mirabilis and density functional theory calculations on related models. Consequences for the ferryl protonation state in catalase, peroxidase and chloroperoxidase
The catalase from Proteus mirabilis peroxide-resistant bacteria is one of the most efficient heme-containing catalases. It forms a relatively stable compound II. We were able to prepare samples of compound II fro...
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Chapter and Conference Paper
57Fe Mössbauer spectra and magnetic data from the kagomé antiferromagnet H3O-jarosite
57Fe Mössbauer spectra are presented from (H30)Fe3(S04)2(OH)6 (or H30-jarosite), which is a model kagomé antiferromagnet which features geometrical frustration and spin-glass-like behaviour....
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Article
Magnetic structures and crystal field in the heavy electron materials YbAgGe and YbPtIn
We have examined the magnetic properties of the heavy electron compounds YbAgGe and YbPtIn by 170Yb Mössbauer spectroscopy down to 0.1 K, and the crystal field properties of YbAgGe by Perturbed Angular Correlati...
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Article
57Fe Mössbauer spectra and magnetic data from the kagomé antiferromagnet H3O-jarosite
57Fe Mössbauer spectra are presented from (H3O)Fe3(SO4)2(OH)6 (or H3O-jarosite), which is a model kagomé antiferromagnet which features geometrical frustration and spin-glass-like behavio...
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Article
The Dynamics of the Guests in Filled Germanium Clathrates
In the filled gallium-germanium clathrates, R8Ga16Ge30, where R is Ba, Sr, or Eu, the guests are located in two large cages and are weakly bound to the crystalline clathrate framework. The caged guests exhibit a ...
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Chapter and Conference Paper
Thermal Behaviour of the μSR Relaxation Rate at High Temperature in Insulators
We show that, in rare earth based insulators, measurement of the thermal dependence of the muon spin-lattice relaxation rate at high temperature provides information on the nature of the magnetic correlations ...
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Article
Transitions and Spin Dynamics at Very Low Temperature in the Pyrochlores Yb2Ti2O7 and Gd2Sn2O7
The very low temperature properties of two pyrochlore compounds, Yb2Ti2O7 and Gd2Sn2O7, were investigated using an ensemble of microscopic and bulk techniques. In both compounds, a first order transition is evide...
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Article
Thermal Behaviour of the μSR Relaxation Rate at High Temperature in Insulators
We show that, in rare earth based insulators, measurement of the thermal dependence of the muon spin-lattice relaxation rate at high temperature provides information on the nature of the magnetic correlations ...
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Chapter and Conference Paper
Transitions and Spin Dynamics at Very Low Temperature in the Pyrochlores Yb2Ti2O7 and Gd2Sn2O7
The very low temperature properties of two pyrochlore compounds, Yb2Ti2O7 and Gd2Sn2O7, were investigated using an ensemble of microscopic and bulk techniques. In both compounds, a first order transition is evide...
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Article
Magnetic properties of Yb Mo O and Gd Mo O from rare earth Mössbauer measurements
Using 170Yb and 155Gd Mössbauer measurements down to ∼ 0.03 K, we have examined the semiconducting pyrochlore Yb2Mo2O7 where the Mo intra-sublattice interaction is anti-ferromagnetic and the metallic pyrochlore G...
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Article
Effective hyperfine temperature in frustrated Gd 2Sn 2O 7: two level model and 155Gd Mössbauer measurements
Using 155Gd Mössbauer spectroscopy down to 27 mK, we show that, in the geometrically frustrated pyrochlore Gd2Sn2O7, the Gd3+ hyperfine levels are populated out of equilibrium. From this, we deduce that the hyper...
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Article
Incommensurate modulated magnetic structure in orthorhombic EuPdSb
Orthorhombic EuPdSb is known to undergo two magnetic transitions, at 12 K and at T N≃ 18 K, and in phase III (T < 12 K), single crystal magnetisation data have shown that the spin structure is collinear antiferro...
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Article
Yb-Based Kondo Lattices: Insight from 170Yb Mössbauer, Positive Muon and γ–γ Perturbed Angular Correlations Spectroscopies
The usefulness of local hyperfine techniques in the investigation of the physical properties of Kondo lattices is illustrated through three examples. First, we show how Mössbauer spectroscopy on 170Yb down to ver...
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Article
Non-Langevin behaviour of the uncompensated magnetization in nanoparticles of artificial ferritin
The magnetic behaviour of nanoparticles of antiferromagnetic artificial ferritin has been investigated by 57Fe Mössbauer absorption spectroscopy and magnetization measurements, in the temperature range 2.5-250 K ...