Abstract
The effect of pressure on the spin density wave (SDW) state in Cr rich Cr–Al, Si, Mn, Fe and Co alloys has been elucidated by neutron diffraction studies. We found that the change of the SDW wave vector Q, by applying pressure, 1/ Q · Δ Q / Δ P , is linearly related to the decrease of T N with increasing pressure 1/ T N · Δ T N / Δ P and that all the results from the Cr–Si, Fe and Co alloys fall on a single straight line independent of their concentrations. Their magnetic phase diagrams in a temperature-pressure coordinate system can be related to the alloy phase diagram by employing an empirical rule that applying pressure corresponds to a decrease in the electron to atom ratio. The non transition metal Si impurity has been found to act as an electron donor, while the effect of Al is not interpreted by the two band nesting model.
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