Abstract
The zero-field magnetic phase diagram of EuxSr1−xS as presently understood is based on neutron diffraction and susceptibility measurements. (1) The nature of the FM-SG boundary is not clear. We have used measurements of MOR as well as microscope examination to contrast the gross magnetic behavior of an X = 0.54 single crystal specimen in the FM and SG regions. Our findings include: (a) Plots of MOR versus field Φ(Ha) in the FM region after cooling in H = 0, initially show a linear increase with Ha, i.e., Φ = AHa, and then saturation at successively higher levels as T is decreased. To our great surprise, this behavior continues smoothly into the SG regime. (b) We measure a remanent rotation at various temperatures ΦR by subjecting the sample to ±16 kOe, then measuring Φ(Ha) in 1 kOe⩽Ha⩽2 kOe. We find Φ(Ha) = ±ΦR+AHa. ΦR is zero for T≳3.6 K. Below this it increases to a maximum, then in SG again increases. (c) We clearly see fine domain structure just below 3.6 K. This very strikingly disappears on cooling below about 1.8 K. We note that these are the first observations of magnetic behavior in the SG regime for a composition which is ferromagnetic at a higher temperature. (1) H. Maletta and W. Felsch, Z. Phys. B 37, 55 (1980).
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