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• W1980280524 abstract "Systematic neutron-scattering experiments have been carried out in order to reveal the crystal and magnetic structures as well as the magnetic excitation in the Ce-based intermetallic compound ${mathrm{CeAgSb}}_{2}.$ It was clarified that the Ag atoms in ${mathrm{CeAgSb}}_{2}$ (space group: $mathrm{P}4/nmm)$ occupy the 2b site, while Sb atoms occupy $2a$ and $2c$ sites, which have, to date, been controversial in literature. From the analysis of neutron powder-diffraction profile, we found the existence of the ferromagnetic component of about $0.41{ensuremath{mu}}_{mathrm{B}}/mathrm{Ce}$ oriented along the c axis, consistent with the result of previous studies. On the other hand, however, no trace of the antiferromagnetic or spin-density wave peak was detected within our range of experimental accuracy. We observed a considerable spin-wave excitation below 3 meV. The dispersion relation was explained by the anisotropic Heisenberg model. This means that ${mathrm{CeAgSb}}_{2}$ has a simple ferromagnetic structure. Furthermore, crystalline electric-field (CEF) excitations were observed at 5.2 and 12.5 meV in the paramagnetic state, which is indicative of the localized nature of the $mathrm{Ce}ensuremath{-}4f$ electron. Our analysis revealed that $|{J}_{z}=ifmmodepmelsetextpmfi{}frac{1}{2}〉$ is the ground state, while the first and second excited levels are mainly due to $|ifmmodepmelsetextpmfi{}frac{3}{2}〉$ and $|ifmmodepmelsetextpmfi{}frac{5}{2}〉,$ respectively. The observed ferromagnetic moment is in good agreement with the ground-state saturation moment, ${g}_{J}{ensuremath{mu}}_{mathrm{B}}{J}_{mathrm{z}}ensuremath{sim}0.43{ensuremath{mu}}_{mathrm{B}}.$ The susceptibility, magnetization curve, and magnetostriction can be explained in terms of the CEF level scheme with anisotropic exchange interaction." @default.
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• W1980280524 date "2003-07-10" @default.
• W1980280524 modified "2023-09-25" @default.
• W1980280524 title "Crystal structure, magnetic ordering, and magnetic excitation in the<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mn>4</mml:mn><mml:mi>f</mml:mi></mml:math>-localized ferromagnet<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>CeAgSb</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>" @default.
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• W1980280524 doi "https://doi.org/10.1103/physrevb.68.024408" @default.
• W1980280524 hasPublicationYear "2003" @default.
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