Magnetic Properties of PrAl2 and ErAl2

Nereson, N. G.; Olsen, C.E.; Arnold, G.

doi:10.1063/1.1655809

Cited by 59 publications

(18 citation statements)

References 15 publications

(1 reference statement)

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“…The rare earth ions occupy equivalent sites of cubic point symmetry Td and form two different sized tetrahedral cavities. The Al sites also form tetrahedral cavities [21][22][23]. As the neutron coherent cross sections for Pr (2.64 barn) and Tb (6.84 barn) are quite different, the intensity profiles obtained from the Rietveld analysis of a neutron powder diffraction data can only be correctly matched for the exact chemical composition.…”

Section: Resultsmentioning

confidence: 97%

Analysis of the crystallographic and magnetic structures of the Tb0.1Pr0.9Al2 and Tb0.25Pr0.75Al2 magnetocaloric compounds by means of neutron scattering

et al. 2015

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Neutron powder diffraction and inelastic neutron scattering data were used to simulate and understand the magnetization and heat capacity curves of the pseudobinary Tb x Pr 1-x Al 2 , with x = 0.10 and 0.25, as a function of temperature. From the Rietveld analysis, we concluded that no crystallographic transition occurs in these samples, and the high symmetry of the magnetic structure was confirmed. Moreover, the different contributions from the reflection planes could be related to the known exchange bias-like effect characteristic for the x = 0.25 sample, also suggesting the existence of some rearrangement of the magnetic moments or even the presence of spin frustration in this system. Finally, the obtained set of theoretical parameters using the mean field approach for the two systems consisting of two sublattices allowed the experimental data to be described and to explain their physical behaviors. The ensemble of our results leads us to affirm that the quadrupolar interactions as well as an existence of some rearrangement of the magnetic moments or a frustration play an important role in the strong unidirectional anisotropy and the exchange bias-like effect observed in this pseudobinary system.

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Section: Resultsmentioning

confidence: 97%

Analysis of the crystallographic and magnetic structures of the Tb0.1Pr0.9Al2 and Tb0.25Pr0.75Al2 magnetocaloric compounds by means of neutron scattering

et al. 2015

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“…GdAl 2 is ferromagnetic with a Curie temperature laying between 153 and 182 K and its effective magnetic moment is around 7.93 m B [5]. The Curie temperature of the PrAl 2 compound is around 34 K and its effective magnetic moment is 3.5 m B [6]. These distinct characteristics can induce interesting ground states for a system where the two rare-earth compounds, Gd and Pr, occupy the R site in the RAl 2 cubic lattice.…”

Section: Introductionmentioning

confidence: 96%

Magnetic coupling between Gd and Pr ions and magnetocaloric effect in Gd0.5Pr0.5Al2 compound

Carvalho

García

Sousa

et al. 2009

Journal of Magnetism and Magnetic Materials

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a b s t r a c tIn this work, we report the theoretical and experimental investigations on the magnetic and magnetocaloric properties for Gd 0.5 Pr 0.5 Al 2 compound in different magnetic fields. The magnetization features indicate that Gd 0.5 Pr 0.5 Al 2 is ferrimagnetic at low temperatures. We also present data from X-ray magnetic circular dichroism (XMCD) experiments for this compound, with which we have confirmed that the magnetic moments of the Pr ions are antiparallel to the magnetic moments of the Gd ions. The magnetocaloric parameters, DT S and DS T , were obtained from calorimetric data and both curves present normal and inverse magnetocaloric effect. A theoretical model for ferrimagnetic coupling, including the crystalline electrical field anisotropy, was used to describe the DT S and DS T experimental results.

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“…[1][2][3][4][5][6][7] These and other investigations have revealed many interesting properties of the RAl 2 family, both from fundamental scientific and applied points of view. The RAl 2 compounds adopt the cubic Laves-phase MgCu 2 -type structure, and they order ferromagnetically at various Curie temperatures which are dependent on the nature of the R atom.…”

Section: Introductionmentioning

confidence: 99%

Multiple magnetic ordering phenomena evaluated by heat capacity measurements inEr1−xTbxAl2Laves-phase al

2009

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Heat capacity measurements in zero and applied magnetic fields have been performed on a series of Er 1−x Tb x Al 2 pseudobinary Laves-phase alloys. Different anomalies that change with Tb concentrations have been observed. These anomalies represent multiple magnetic ordering phenomena, similar to those reported in Er 1−x Pr x and Er 1−x Dy x Al 2 alloys. In common, all alloys contain mixtures of lanthanide metals with opposite signs of the second-order Steven's operators, which were believed to cause competition between the magnetoelastic, crystalline electric field, and quadrupolar effects. This competition gives rise to the observed multiple magnetic ordering transitions in Er 1−x Pr x and Er 1−x Dy x Al 2 alloys. Tb and Er also have opposite signs of second-order Steven's factors, and therefore the observed anomalies in the Er 1−x Tb x Al 2 alloys may also be interpreted in terms of competing quadrupolar, magnetoelastic, and crystalline electric field effects. The magnetocaloric properties of the Er 1−x Tb x Al 2 alloy system have also been evaluated.

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Magnetic Properties of PrAl2 and ErAl2

Cited by 59 publications

References 15 publications

Analysis of the crystallographic and magnetic structures of the Tb0.1Pr0.9Al2 and Tb0.25Pr0.75Al2 magnetocaloric compounds by means of neutron scattering

Analysis of the crystallographic and magnetic structures of the Tb0.1Pr0.9Al2 and Tb0.25Pr0.75Al2 magnetocaloric compounds by means of neutron scattering

Magnetic coupling between Gd and Pr ions and magnetocaloric effect in Gd0.5Pr0.5Al2 compound

Multiple magnetic ordering phenomena evaluated by heat capacity measurements inEr1−xTbxAl2Laves-phase al

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