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- W2097809631 abstract "Undoped ${mathrm{CoS}}_{2}$ is an isotropic itinerant ferromagnet with a continuous or nearly continuous phase transition at ${T}_{mathrm{C}}=122mathrm{K}.$ In the doped ${mathrm{CoS}}_{1.9}{mathrm{Se}}_{0.1}$ system, the Curie temperature is lowered to ${T}_{mathrm{C}}=90mathrm{K},$ and the transition becomes clearly first order in nature. In particular we find a discontinuous evolution of the spin dynamics as well as strong time relaxation in the ferromagnetic Bragg intensity and small-angle neutron scattering in the vicinity of the ferromagnetic transition. In the ordered state the long-wavelength spin excitations were found to be conventional ferromagnetic spin waves with negligible spin-wave gap $(<0.04mathrm{meV}),$ indicating that this system is also an excellent isotropic (soft) ferromagnet. In a wide temperature range up to ${0.9T}_{mathrm{C}},$ the spin-wave stiffness $D(T)$ follows the prediction of the two-magnon interaction theory, $D(T)=D(0)(1ensuremath{-}{mathrm{AT}}^{5/2}),$ with $D(0)=131.7ifmmodepmelsetextpmfi{}2.8mathrm{meV}{AA{}}^{2}.$ The stiffness, however, does not collapse as $stackrel{ensuremath{rightarrow}}{T}{T}_{mathrm{C}}$ from below. Instead a quasielastic central peak abruptly develops in the excitation spectrum, quite similar to results found in the colossal magnetoresistance oxides such as ${(mathrm{L}mathrm{a}ensuremath{-}mathrm{C}mathrm{a})mathrm{MnO}}_{3}.$" @default.
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- W2097809631 date "2003-12-09" @default.
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- W2097809631 title "First-order transition in the itinerant ferromagnetCoS1.9Se0.1" @default.
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- W2097809631 doi "https://doi.org/10.1103/physrevb.68.214411" @default.
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