Effect of pressure on the magnetic phase diagram of the antiferromagnetic spin-density-wave alloy Cr-1.6% Si

A neutron diffraction experiment has been performed to study the effects of high pressure on the magnetic phase diagram of a single crystal specimen of Cr-1.6%Si. At applied pressures up to 0.49 GPa there are two clear transitions. At T{sub NC} there is a transition from a paramagnetic (P) to a commensurate spin density wave (CSDW), while at lower temperatures there is a transition to a mixed state where the CSDW seems to coexist with an incommensurate SDW (ISDW) state. T{sub NC} decreases with the application of pressure while the transition temperature T{sub CI} to the mixed C-I state seems to be insensitive to pressure. At 0.69 GPa the ISDW state disappears while the P-C transition changes drastically