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- W2036304854 startingPage "A851" @default.
- W2036304854 abstract "Thermodynamic properties of a ferromagnet at $T>{T}_{C}$ containing a small amount of paramagnetic ions (with spin textonehalf{}) are studied theoretically. The exact form of the static susceptibility of this system just above the Curie point is given under the following assumptions: (1) The interaction between a paramagnetic impurity and the magnetic carriers of the ferromagnet is described by the usual $sensuremath{-}d$ type interaction. (2) Lorentzian decay of the fluctuating component of the magnetization of the host ferromagnet is valid at least for long time behavior of this component. (3) The interaction between impurities is neglected. (4) $k{T}_{C}ensuremath{gg}frac{ensuremath{hbar}}{{ensuremath{tau}}_{q}}$, where ${ensuremath{tau}}_{q}$ is the relaxation time of Lorenzian decay of the magnetization oscillating in space with wave vector $q$ ($q$ being limited to the first Brillouin zone). It is concluded that as $Tensuremath{rightarrow}{T}_{C}$ the impurities always decrease the total susceptibility regardless of the sign of the exchange integral between an impurity electron and the magnetic carriers. Thus, the naive picture based on the first-order effect of the $sensuremath{-}d$ exchange interaction is subject to a crucial modification at the critical spin fluctuation of the host ferromagnet." @default.
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- W2036304854 date "1964-02-03" @default.
- W2036304854 modified "2023-09-26" @default.
- W2036304854 title "Anomalous Susceptibility Due to Paramagnetic Impurities" @default.
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- W2036304854 doi "https://doi.org/10.1103/physrev.133.a851" @default.
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