Magnetic properties and instability phenomena in doped Euo

Mauger, A.; Godart, C.; Escorne, M.; Achard, Jocelyn; Desfours, J.P.

doi:10.1051/jphys:0197800390100112500

Cited by 28 publications

(17 citation statements)

References 13 publications

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“…The data shown in Fig. 1 are comparable to the data published by Mauger et al 31 This is one of the indications that our samples are consistent with those of other authors, though coming from different sources at different times. Other such signs of consistency among samples will come from NMR data, as shown below.…”

Section: Magnetization Vs Temperaturesupporting

confidence: 92%

“…We observed an abrupt increase of the amplitude of the exchange interaction with doping. This is consistent with the dependence on Gd concentration of the Curie temperature for which different theoretical explanations have been proposed by Mauger et al, 31,59 Nolting and Oleś, 60 We discovered that the lineshape of the Eu resonance in Gd doped EuO was broader than in pure EuO and that the broadening increases abruptly with Gd concentration. We also observed that the broadening increases with increasing temperature.…”

Section: Exchange Integral J Vs Dopingsupporting

confidence: 91%

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Magnetic properties of pure and Gd-doped EuO probed by NMR

et al. 2005

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An Eu NMR study in the ferromagnetic phase of pure and Gd doped EuO was performed. A complete description of the NMR lineshape of pure EuO allowed for the influence of doping EuO with Gd impurities to be highlighted. The presence of a temperature dependent static magnetic inhomogeneity in Gd doped EuO was demonstrated by studying the temperature dependence of the lineshapes. The results suggest that the inhomogeneity in 0.6% Gd doped EuO is linked to colossal magnetoresistance. The measurement of the spin-lattice relaxation times as a function of temperature led to the determination of the value of the exchange integral J as a function of Gd doping. It was found that J is temperature independent and spatially homogeneous for all the samples and that its value increases abruptly with increasing Gd doping.

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Section: Magnetization Vs Temperaturesupporting

confidence: 92%

Section: Exchange Integral J Vs Dopingsupporting

confidence: 91%

Magnetic properties of pure and Gd-doped EuO probed by NMR

et al. 2005

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“…7 is that the maximum value for T C with Gd doping is 125 K. We cannot reproduce the higher values (e.g., 130-170 K) reported in the literature. 7,8,9,10,12,13,14,15,18 It was inferred that stoichiometry problems could add to an extra increase in T C . 5,11 In this respect it is interesting to note that indeed oxygen deficiencies in Gd-free EuO samples already lead to enhancements of T C up to 140-150 K. 17,19,20 In our case we can exclude the presence of oxygen vacancies: the samples all were grown under Eu-distillation conditions, and under these conditions we have observed for the pure EuO films that they have the bulk T C value of 69 K and that they remain semiconducting and are, in fact, extremely insulating down to the lowest temperatures.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Epitaxy, stoichiometry, and magnetic properties of Gd-doped EuO films on YSZ (001)

et al. 2009

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We have succeeded in preparing high-quality Gd-doped single-crystalline EuO films. Using Eudistillation-assisted molecular beam epitaxy and a systematic variation in the Gd and oxygen deposition rates, we have been able to observe sustained layer-by-layer epitaxial growth on yttriastabilized cubic zirconia (001). The presence of Gd helps to stabilize the layer-by-layer growth mode. We used soft x-ray absorption spectroscopy at the Eu and Gd M4,5 edges to confirm the absence of Eu 3+ contaminants and to determine the actual Gd concentration. The distillation process ensures the absence of oxygen vacancies in the films. From magnetization measurements we found the Curie temperature to increase smoothly as a function of doping from 70 K up to a maximum of 125 K. A threshold behavior was not observed for concentrations as low as 0.2%.

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“…The interaction between the Eu f-electrons and the dopant electrons enhances the ferromagnetic exchange energy 4,5 and results in an increased T C . To date, this has been accomplished through the use of trivalent cations including iron, [6][7][8] lanthanum, 1,9,10 gadolinium, [11][12][13][14][15][16][17] and holmium. 9 Alternatively, the T C can be increased by deliberately making oxygen-deficient EuO such that the resulting oxygen vacancies donate an electron.…”

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confidence: 99%

Lutetium-doped EuO films grown by molecular-beam epitaxy

Melville

Mairoser

Schmehl

et al. 2012

Applied Physics Letters

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The effect of lutetium doping on the structural, electronic, and magnetic properties of epitaxial EuO thin films grown by reactive molecular-beam epitaxy is experimentally investigated. The behavior of Lu-doped EuO is contrasted with doping by lanthanum and gadolinium. All three dopants are found to behave similarly despite differences in electronic configuration and ionic size. Andreev reflection measurements on Lu-doped EuO reveal a spin-polarization of 96% in the conduction band, despite non-magnetic carriers introduced by 5% lutetium doping.

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Magnetic properties and instability phenomena in doped Euo

Abstract: Résumé. 2014 Nous avons étudié l'influence de la concentration de porteurs libres sur les propriétés magnétiques de

Cited by 28 publications

References 13 publications

Magnetic properties of pure and Gd-doped EuO probed by NMR

Magnetic properties of pure and Gd-doped EuO probed by NMR

Epitaxy, stoichiometry, and magnetic properties of Gd-doped EuO films on YSZ (001)

Lutetium-doped EuO films grown by molecular-beam epitaxy

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