Magnetic properties of the neptunium oxychalcogenides NpOZ (Z = S, Se)

Amoretti, G.; Blaise, A.; Bogé, M.; Bonnisseau, D.; Burlet, P.; Collard, J.M.; Fournier, J.M.; Quézel, S.; Rossat‐Mignod, J.; Larroque, J.

doi:10.1016/0304-8853(89)90100-5

Cited by 16 publications

(19 citation statements)

References 22 publications

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“…The two sets of the B kq parameters differ considerably for the two compounds, especially B 20 and B 44 : B 20 is strongly influenced by the induced dipoles. Negative values of B 20 are consistent with the Amoretti et al [5] analysis of the M . ossbauer spectra.…”

Section: Resultssupporting

confidence: 87%

“…The ground state wave function for NpOS reads: 0.847 4 I 9/2,5/2 À0.358 2 H2 9/2,5/2 À0.312 4 I 9/2,-3/2 +0.131 2 H2 9/2,-3/2 . The ordered magnetic moment m is equal to 0.82 m B if it is, as suggested in [5], perpendicular to the z-axis. The meanfield energy (i.e.…”

Section: Resultsmentioning

confidence: 99%

“…At that point, the procedure must be reversed to get unknown CFP for the neptunium oxychalcogenides: we scale the e a parameters for the Np-O, Np-S and Np-Se systems in the neptunium oxychalcogenides, using, again, their ratios from the mentioned first principle calculations and crystallographic data of Ref. [5]. CFP's resolved from these e a 's have to be, as previously, supplemented with the actual lattice contribution fn, i.e.…”

Section: Resultsmentioning

confidence: 99%

“…ossbauer spectroscopy and neutron diffraction data were investigated by Amoretti et al [5]. Despite of apparent similarity of the two crystals (tetragonal, PbFCl type) and perhaps the stacking order of the antiferromagnetic phases, a different ordered moments 0.82 and 1.64 m B for NpOS and NpOSe have been revealed.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Crystal field effect in light actinide dioxides and oxychalcogenides—a unified phenomenological description

Gajek¹

2004

Journal of Magnetism and Magnetic Materials

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Crystal field effect in light actinide dioxides and oxychalcogenides—a unified phenomenological description

Gajek¹

2004

Journal of Magnetism and Magnetic Materials

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“…the crystal-field effect. The splitting due to large crystal-field in the 5f system can be in the order 600 K [15]. The splitting will reduce both the ground state and the corresponding effective moment.…”

Section: Methodsmentioning

confidence: 99%

Magnetism and electron spin resonance in single crystalline β-AgNpO2(SeO3)

Jobiliong

Oshima

Brooks

et al. 2004

Solid State Communications

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We report magnetization, susceptibility, electrical transport, and electron spin resonance (ESR) studies of single crystals of β-AgNpO 2 (SeO 3 ). Here the valence of the Np sites is expected to be Np(V). We observe a magnetic transition below 8 K, where the transition temperature is dependent on the effective magnetic moment. Although the transition appears to be ferromagnetic, no hysteresis is seen in the magnetization, and the saturation moment above 0.1 T is found to be about 60% of the free NpO 2 ion moment. The decrease in the Np moments determined experimentally is thought to arise from crystal field and spin-orbit effects. Although Np(V) is expected to be ESR silent, we observe temperature dependent ESR spectra at ~44 GHz (for fields above the saturation field) that show slight shifts in the g-factor and line width at low temperatures. Our results provide evidence that both Np(V) and Np(IV) valences are present, where the latter may be a minority population. The crystals, although dark in appearance, are electrically insulating (ρ > 10 10 Ohm-cm) at room temperature.Moreover, the 5f electron systems have a greater exposure to their chemical environments than do the 4f electron systems, and hence the crystal field effect plays a significant role with the spinorbit coupling. Thus, it is necessary to consider the crystal structure, spin-orbit coupling, and crystal-field splitting in order to fully understand the magnetic properties of these compounds.

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Introduction

Kaczorowski¹

Landolt-Börnstein - Group III Condensed Matter

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Magnetic properties of the neptunium oxychalcogenides NpOZ (Z = S, Se)

Cited by 16 publications

References 22 publications

Crystal field effect in light actinide dioxides and oxychalcogenides—a unified phenomenological description

Crystal field effect in light actinide dioxides and oxychalcogenides—a unified phenomenological description

Magnetism and electron spin resonance in single crystalline β-AgNpO2(SeO3)

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