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- W1985141787 abstract "We study theoretically the hyperfine field at the nucleus of a rare-earth impurity embedded in a transition host. This system is a limiting case of the Blandin-Campbell problem, namely, that of the hyperfine field at a nonmagnetic impurity site in a metallic matrix doped with a magnetic impurity at a distance ${stackrel{ensuremath{rightarrow}}{mathrm{R}}}_{0}$ (Heusler alloys). In the case we study both the polarizing spin and the charge impurity potential collapse into the same site (i.e., ${stackrel{ensuremath{rightarrow}}{mathrm{R}}}_{0}=0$). Furthermore, one must consider a more complicated band structure: an $s$- and $d$-character conduction band. We perform numerical computations for a number of model band structures taking into account the two-band nature of the transition metals and treating the exchange couplings of the impurity $f$ spin with the $s$- and $d$-electron gas to first order in perturbation. The $s$ and $d$ hyperfine contributions are calculated in terms of local magnetic responses ${overline{ensuremath{chi}}}^{ensuremath{lambda}ensuremath{mu}}(0)$ ($ensuremath{lambda},ensuremath{mu}=s,d$) which incorporates the host band structure, charge potential and local correlations, and ratios between the hyperfine parameters ${A}_{mathrm{cp}}$ and $A(Z)$. We find that the $s$ contribution to the hyperfine field may change sign with the impurity potential difference between rare-earth impurity and the matrix. However, the $d$ contribution does not; as it is the dominant one, the total hyperfine field remains always positive (negative) throughout the transition-metal series depending on whether the exchange coupling ${J}^{(d)}$ between the $d$-electron gas and the $f$ local spin is negative (positive). Our theory may be useful to extract information on the order parameter in certain spin-glass systems from hyperfine-field measurements. Our theoretical results are compared with some available experimental data and further systematic experimental studies are suggested, including spin-glass systems." @default.
- W1985141787 created "2016-06-24" @default.
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- W1985141787 date "1978-05-01" @default.
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- W1985141787 title "Theoretical study of hyperfine fields of rare-earth impurities in transition hosts" @default.
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- W1985141787 doi "https://doi.org/10.1103/physrevb.17.3501" @default.
- W1985141787 hasPublicationYear "1978" @default.
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