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I have measured the magnetic and transport properties of Fe and Co in the variable SDW host, CrMo. Analyzing the behaviour of the Neel temperature shows that Co interacts with the SDW, almost an order of magnitude more strongly than does Fe. Also that it magnetically polarizes the SDW more strongly than Fe. Resistivity measurements show that Co reduces the nesting area of the Fermi surface while Fe increases it. Overall, the Neel temperature is strongly reduced by Fe and much less reduced by Co. / Magnetic susceptibility measurements show that Fe supports an effective magnetic moment below T(,N) while Co does not. However, as suggested by Friedel, only nearest neighbour Fe pairs contribute to the effective Fe moment, while isolated Fe moments, like Co, are locked into the SDW antiferromagnetism. / In the absence of SDW formation, the strong interaction between Co and the CrMo host leads to a Kondo state, while the smaller interaction with Fe allows the onset of spin glass ordering.

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