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• W1970078725 endingPage "2039" @default.
• W1970078725 startingPage "2030" @default.
• W1970078725 abstract "RbNi${mathrm{F}}_{3}$ is a transparent hexagonal ferrimagnet with ${T}_{c}=133ifmmode^circelsetextdegreefi{}$K. Below ${T}_{c}$ the ${mathrm{Ni}}^{++}$ magnetic moments are aligned collinearly in ferromagnetic hexagonal sheets with a stacking sequence of these planes $mathrm{BBABBA}$ such that the $A$ spins are antiparallel to the $B$ spins. This magnetic structure is determined by a 180ifmmode^circelsetextdegreefi{} antiferromagnetic exchange between nearest-neighbor $A$, $B$ spins and a 90ifmmode^circelsetextdegreefi{} ferromagnetic exchange between nearest-neighbor $B$ spins. In this paper we report a detailed inelastic-neutron-scattering study of the spin waves in RbNi${mathrm{F}}_{3}$ both at low temperatures and through ${T}_{c}$. The magnetic unit cell contains six ${mathrm{Ni}}^{++}$ spins so that there are in general six distinct branches in the spin-wave spectrum. All six branches are observed in the $ensuremath{Gamma}A$ direction ($c$ axis), while only the lowest three are observed in the $ensuremath{Gamma}M$ direction. The measured dispersion curves at 4.2ifmmode^circelsetextdegreefi{}K may be accurately fitted using simple spin-wave theory with ${J}_{mathrm{AB}}=(93.2ifmmodepmelsetextpmfi{}2)ifmmode^circelsetextdegreefi{}$K, ${J}_{mathrm{BB}}=ensuremath{-}(21.1ifmmodepmelsetextpmfi{}2)ifmmode^circelsetextdegreefi{}$K ($mathcal{H}=ensuremath{Sigma}{i>j}^{}{J}_{mathrm{ij}}{stackrel{ensuremath{rightarrow}}{mathrm{S}}}_{i}ifmmodecdotelsetextperiodcenteredfi{}{stackrel{ensuremath{rightarrow}}{mathrm{S}}}_{j}$, $S=1$), and with all other exchange constants set to zero. Using these exchange constants we can satisfactorily account for other magnetic properties such as the high-temperature susceptibility, the sublattice magnetizations in a field, and two-magnon Raman scattering. At higher temperatures it is found that the $c$-axis acoustic magnons renormalize like the magnetization, whereas the high-lying optic modes are nearly temperature independent. This leads one to the physical picture in which RbNi${mathrm{F}}_{3}$ at high temperatures is viewed as a set of strongly correlated two-dimensional ferrimagnets composed of three successive planes $mathrm{BAB}$ coupled by the strong exchange field ${H}_{mathrm{AB}}ensuremath{sim}6{J}_{mathrm{AB}}$; these $mathrm{BAB}$ two-dimensional ferrimagnets are then coupled together by the much weaker exchange field ${H}_{mathrm{BB}}ensuremath{sim}{J}_{mathrm{BB}}$." @default.
• W1970078725 created "2016-06-24" @default.
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• W1970078725 date "1972-09-01" @default.
• W1970078725 modified "2023-09-23" @default.
• W1970078725 title "Neutron-Scattering Study of Spin Waves in the Ferrimagnet RbNi<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>F</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>" @default.
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• W1970078725 doi "https://doi.org/10.1103/physrevb.6.2030" @default.
• W1970078725 hasPublicationYear "1972" @default.
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