Nonuniform Magnetic States and Electrical Properties of ${\rm Sm}_{\rm X}{\rm Mn}_{1-{\rm X}}{\rm S}$ Solid Solutions

The real and imaginary parts of magnetic permeability at the three frequencies 100 Hz, 1 kHz and 10 kHz and magnetic moment in magnetic field H = 0.05 T in the Sm
_X
Mn
_1-X
S(0.1 ≤ × ≤ 0.25) solid solutions at the temperatures 5 K-300 K were measured. Magnetization curves were measured in the range of fields - 9 T <; H <; 9 T at the temperatures T = 5 K, 50 K. Non-linear behavior of the magnetization versus field, residual magnetic moment, logarithmic dependence of imaginary parts of the magnetic permeability maximum on frequency and sharp drop of Im(μ) at T <; 40 K for compound Sm
_0.25
Mn
_0.75
S were found. The electrical resistivity of the Sm
_X
Mn
_1-X
S(0.15 <; x <; 0.25) solid solution in the range of temperatures 80 K-300 K were measured. Minimum and maximum in the temperature dependence of the resistivity were found respectively at T = 220 K for X = 0.15 and at T = 100 K for X = 0.2 compounds. This behavior is explained a result of the mobility edge movement and the disorder of the deformation and spin density fluctuations with short-range order.