Magnetic and crystallographic characteristics of (Pr,La)Al3, (Pr,Y)Al3, (Pr,La)Al2 and (Pr,Y)Al2

Mader, K.; Segal, E.; Wallace, W.E.

doi:10.1016/0022-3697(69)90334-5

Cited by 60 publications

(19 citation statements)

References 20 publications

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“…(4) is In this paper the HCF will be constructed taking into account only the two lowest levels of Pr+3 in a hexagonal symmetry [2] (Fig. 1 shows the three first levels of the complete level scheme [3]). In the case of Pr+ 3 in PrAl3, according to Mader et al [3], these two levels are singlets separated by an energy gap ∆ = 3.41 meV.…”

Section: Model Hamiltonian and Magnetic Quantitiesmentioning

confidence: 99%

“…1 shows the three first levels of the complete level scheme [3]). In the case of Pr+ 3 in PrAl3, according to Mader et al [3], these two levels are singlets separated by an energy gap ∆ = 3.41 meV. The eigenfunctions of these levels are:…”

Section: Model Hamiltonian and Magnetic Quantitiesmentioning

confidence: 99%

“…Figure 4 shows the reduced inverse ionic susceptibility given by Eq. (16) The magnetic susceptibility of PrAl3 was experimentally studied by Mader et al [3]. Figure 5 shows the inverse susceptibility versus temperature, obtained using Eq.…”

Section: Magnetic State Equationsmentioning

confidence: 99%

“…Figure 5 shows the inverse susceptibility versus temperature, obtained using Eq. (16) together with the experimental points of Mader et al [3]. The fitting is for εF = 8.2 eV, ∆ = 3.41 meV, J0 = 6.82 meV and α0 = L95.…”

Section: Magnetic State Equationsmentioning

confidence: 99%

“…In Section 2 the model Hamiltonian and the magnetic quantities are presented, in Section 3 the magnetic state equation for the ionic and electronic magnetization are derived and an explicit expression for the ionic susceptibility is obtained in Section 4. Finally, in Section 5 an application of the results of the model to PrAl3 is discussed and the parameters of the model are estimated using the experimental temperature dependence of the susceptibility of PrAl3 [3].…”

Section: Introductionmentioning

confidence: 99%

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A Simple Localized-Itinerant Model for PrAl₃: Crystal Field and Exchange Effects

1991

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We present a simple magnetic model for PrAl3. The effects of crystal field are treated using a reduced set of levels and the corresponding wave functions are extracted from the actual crystal field 1evels of Pr+ 3 in a hexagonal symmetry. The exchange between 4f-and conduction-electrons are dealt within a molecular field approximation. An analytical magnetic state equation is derived and the magnetic behaviour discussed. The parameters of the model are estimated from a fitting of the inverse susceptibility of PrAl3 given in the literature.

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Section: Model Hamiltonian and Magnetic Quantitiesmentioning

confidence: 99%

Section: Model Hamiltonian and Magnetic Quantitiesmentioning

confidence: 99%

Section: Magnetic State Equationsmentioning

confidence: 99%

Section: Magnetic State Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Simple Localized-Itinerant Model for PrAl₃: Crystal Field and Exchange Effects

1991

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Magnetic properties of rare earth hydrides

Wallace

1972

Ber Bunsenges Phys Chem

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Magnetic measurements on fully hydrogenated rare earth metals give no indication of magnetic ordering at temperatures down to 4 °K, whereas the corresponding elemental rare earth metals, except Pr, order at temperatures ranging from 19°K for Nd to 289 °K for Gd. The results are consistent with electrical resistivity measurements which indicate that these hydrides are not metallic conductors. Since the RKKY interaction is inoperative in the hydrides, ordering temperatures are depressed below 4°K. Detailed analysis of the paramagnetic behavior of PrH2 shows that experiment is consistent only with the anionic model for hydrogen in rare earth hydrides. Rare earth dihydrides, which are metallic conductors, do show magnetic ordering at temperatures ranging from 8°K, for HoH2 and DyH2, to 40°K, for TbH2, EuH2, alone among the dihydrides which order, becomes ferromagnetic.Rare earth intermetallics of the formula RT2 and RT5 (T = Co or Ni) absorb hydrogen with noticeable effect on their magnetic and electrical properties. Virgin samples of PrCo2 and NdCo2 order at 45 and 116 °K, respectively. After degassing under ultrahigh vacuum conditions at elevated temperature, these materials fail to exhibit magnetic ordering down to 4°K. A discussion is given of factors which probably bring about this striking sensitivity to hydrogen concentration.

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Crystal Field Levels of Pr³⁺ in PrAl₃ Studied by Inelastic Neutron Scattering

Andreeff

Kaun

Lippold

et al. 1978

Physica Status Solidi (b)

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The crystal field splitting of the ,H., ground multiplet of the Pr3+ ion in the intermetallic compound PrAl, is investigated by inelastic scattering of thermal neutrons. At several temperatures crystal field transitions are measured by TOF and TAS methods for polycrystalline PrAI,. I n order to decide between crystal field transitions and phonon scattering, the isostructural, nonmagnetic compound LaAI, is also measured. The crystal field parameters and the energy level scheme for the ground multiplet splitting in PrAI, are given.Die Kristallfeldaufspaltung des 3H,-Grundzustandsmultipletts von Pr3+ in der intermetallischen Verbindung PrAI, wird mittels inelastischer Streuung thermischer Neutronen untersucht. Die Kristallfeldiibergiinge in PrAI, werden bei verschiedenen Temperaturen mit Hilfe von Flugzeitund Dreiachsenspektrometer gemessen. Um zwischen Kristallfeldiibergiingen und Phononenstreuung zu unterscheiden, wird die isostrukturelle, nichtmagnetische Verbindung LaAI, ebenfalls untersucht. Die Kristallfeldparameter und das Niveauschema der Aufspaltung des Grundzustandsmultipletts in PrAI, werden angegeben.

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Magnetic and crystallographic characteristics of (Pr,La)Al3, (Pr,Y)Al3, (Pr,La)Al2 and (Pr,Y)Al2

Cited by 60 publications

References 20 publications

A Simple Localized-Itinerant Model for PrAl₃: Crystal Field and Exchange Effects

A Simple Localized-Itinerant Model for PrAl₃: Crystal Field and Exchange Effects

Magnetic properties of rare earth hydrides

Crystal Field Levels of Pr³⁺ in PrAl₃ Studied by Inelastic Neutron Scattering

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Magnetic and crystallographic characteristics of (Pr,La)Al3, (Pr,Y)Al3, (Pr,La)Al2 and (Pr,Y)Al2

Cited by 60 publications

References 20 publications

A Simple Localized-Itinerant Model for PrAl3: Crystal Field and Exchange Effects

A Simple Localized-Itinerant Model for PrAl3: Crystal Field and Exchange Effects

Magnetic properties of rare earth hydrides

Crystal Field Levels of Pr3+ in PrAl3 Studied by Inelastic Neutron Scattering

Contact Info

Product

Resources

About

A Simple Localized-Itinerant Model for PrAl₃: Crystal Field and Exchange Effects

A Simple Localized-Itinerant Model for PrAl₃: Crystal Field and Exchange Effects

Crystal Field Levels of Pr³⁺ in PrAl₃ Studied by Inelastic Neutron Scattering