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The temperature dependence of the solute magnetic susceptibility of very dilute Cu-Fe alloys shows an anomaly at a temperature in the range 6-17^∘{}K. The effective Bohr-magneton value of the localized moment is appreciably reduced below this temperature. It is suggested that this anomaly can be interpreted as further evidence of the formation of a quasibound election state as suggested by Nagaoka.
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C. M. Hurd (1967) studied this question.
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