Fig. 1

Temperature dependence of the dc magnetic susceptibility for H || c-axis, measured in a dc field of 10 Oe, for Fe_0.975Cu_0.025Te_0.66Se_0.34 under ambient pressure and applied hydrostatic pressure of 10 kbar, and for Fe_0.99Te_0.66Se_0.34 under ambient pressure. The inset shows raw magnetic data.