Neutron scattering from the Heisenberg ferromagnets EuO and EuS. I. The exchange interactions

Passell, L.; Dietrich, O. W.; Als‐Nielsen, J.

doi:10.1103/physrevb.14.4897

Cited by 199 publications

(88 citation statements)

References 27 publications

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“…The other causes of uncertainty are the error on the T 1 measurement and the error on the temperature measurement. An evaluation of the total error leads to ∆J/k B = 0.01 K. Previous measurements on powdered EuO by neutron scattering experiments and specific heat measurements led respectively to (J 1 + J 2 )/k B = 0.725 ± 0.006 K, 46 and (J 1 + J 2 )/k B = 0.714 ± 0.007 K. 47 48 These values lead to a value of the exchange integral J = 0.750 ± 0.017 K which is in very good agreement with our measurement. Note that in 1966 E. L. Boyd deduced J 1 and J 2 by measuring the temperature dependence of the NMR frequency of 153 Eu.…”

Section: A Spin-lattice Relaxation Timesmentioning

confidence: 99%

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: A Spin-lattice Relaxation Timesmentioning

confidence: 99%

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

et al. 2005

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“…Our exchange parameters for the optimized bulk lattice parameter (J 1 = 0.66, J 2 = 0.19) are in good agreement with neutron measurements, and previous calculations. [23,24] Previous experimental studies have looked at the effect of hydrostatic pressure on T c [10,25] and the unit cell volume [26] in EuO. In Figure 2b we combine that data to plot the experimental change in T c as a function of lattice parameter.…”

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confidence: 99%

Influence of epitaxial strain on the ferromagnetic semiconductorEuO: First-principles calculations

2008

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From first principles calculations we investigate the electronic structure and the magnetic properties of EuO under hydrostatic and epitaxial forces. There is a complex interdependence of the O 2p and Eu 4f and 5d bands on the magnetism in EuO, and decreasing lattice parameters is an ideal method to increase the Curie temperature, Tc. Compared to hydrostatic pressure, the out-of-plane compensation that is available to epitaxial films influences this increase in Tc, although it is minimized by the small value of poisson's ratio for EuO. We find the semiconducting gap closes at a 6% in-plane lattice compression for epitaxy, at which point a significant conceptual change must occur in the active exchange mechanisms.

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“…13,[22][23][24][25][26] Until now, the properties of antiferromagnetic/nonmagnetic EuTe-PbTe structures have been studied, for which an interlayer coupling, 6,27 a decrease of Néel temperature with decreasing EuTe layer thickness, 28 and anisotropy effects [28][29][30][31] were found. A ferromagnetic/ nonmagnetic multilayer system of EuS intercalated with insulating SrS has been studied as well.…”

Section: Introductionmentioning

confidence: 99%

“…11,15,21 Each Eu 2ϩ ion in the EuS lattice is ferromagnetically coupled to its 12 nearest magnetic neighbors ͑NN͒ (J NN /k B ϭϩ0.22 K) and is antiferromagnetically coupled to its six next-nearest neighbors ͑NNN͒ (J NNN /k B ϭϪ0.10 K). 15,22,23 Interactions beyond NN and NNN are believed to be of minor importance. Bulk EuS orders ferromagnetically at T C ϭ16.6 K.…”

Section: Introductionmentioning

confidence: 99%

Ferromagnetic transition in EuS-PbS multilayers

et al. 1999

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Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers)Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication Citation for published version (APA):Stachow-Wojcik, A., Story, T., Dobrowolski, W., Arciszewska, M., Galazka, R. R., Kreijveld, M. W., ... Sipatov, A. Y. (1999). Ferromagnetic transition in EuS-PbS multilayers. Physical Review B, 60(22), 15220-15229. DOI: 10.1103/PhysRevB.60.15220 General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. The magnetic properties of multilayers of ferromagnetic EuS intercalated with diamagnetic PbS were studied as a function of the EuS layer thickness ͑varying from 2 to 200 ML͒. The critical temperature T C of the paramagnet-ferromagnet phase transition was determined from magnetization vs temperature measurements and was found to depend on the underlying substrate ͓KCl ͑100͒ vs BaF 2 ͑111͔͒ as well as on the thickness of the EuS layer. For thick layers (d EuS Ϸ200 ML), which mimic semibulk EuS, the T C values were found shifted with respect to the bulk EuS ͑about 1 K up for layers grown on KCl and about 3 K down for layers grown on BaF 2 ). This effect is attributed to stress resulting mainly from the difference of thermal expansion coefficients between the substrate and the structure. For thin layers (d EuS Ͻ10 ML), a systematic reduction of T C with decreasing EuS layer thickness was observed. This behavior is discussed from two points of view: ͑a͒ the reduction of the average number of magnetic neighbors because of the increasing role of the interface for the thin layers, and ͑b͒ the three-dimensional/two-dimensional ͑3D/2D͒ crossover from a 3D Heisenberg-type ferromagnet to a 2D XY or Ising-like sy...

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Neutron scattering from the Heisenberg ferromagnets EuO and EuS. I. The exchange interactions

Cited by 199 publications

References 27 publications

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

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

Influence of epitaxial strain on the ferromagnetic semiconductorEuO: First-principles calculations

Ferromagnetic transition in EuS-PbS multilayers

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