Low-temperature electronic and magnetic transitions in the antiferromagnetic semiconductor Cr0.5Mn0.5S

Magnetoresistive effect in YbxMn1-xSat small concentrations

“…In Yb x Mn 1-x S c x = 0.1, the activation energy of current carriers in the magnetic field decreases and the magnetoresistive coefficient changes sign from negative to positive at T = 260 K (figure 2b). The maximum value (ρ(Н)ρ(0)) / ρ(0) is observed at T = 360 K and the magnetoresistive effect disappears asymptotically at T = 500 K. The formation of an orbital ordering [26,27] of the glass state type [28,29] can lead to a change in elastic characteristics, both static and dynamic, for example, a change in the impedance in a magnetic field [30]. Below the coefficient of thermal expansion of the lattice as a function of temperature is studded.…”

Magnetic properties of single crystals of the Cr x Mn1 − x S solid solutions (0 ≤ x < 0.3)

“…According to [3], these materials are antiferromagnets with the Néel temperature increasing to 240 K as the chromium concentration increases (x = 0.67). Investi gation of the polycrystalline Cr x Mn 1 -x S sample with x = 0.5 showed the presence of the ferromagnetic tran sition at 66 K [4]. In the region of this transition, neg ative magnetoresistance (NMR) is found [5].…”

“…Discrepancies in the data presented in [3,4] allowed us to pose the question on magnetic properties of the Cr x Mn 1 -x S sulfides again.…”

“…The results of the syn thesis of solid solutions of this system were for the first time published in [2]. Magnetic properties of polycrys talline Cr x Mn 1 -x S samples are presented in [3,4]. According to [3], these materials are antiferromagnets with the Néel temperature increasing to 240 K as the chromium concentration increases (x = 0.67).…”

“…Poly crystalline sulfides of the Cr x Mn 1 -x S system, which were synthesized on the basis of manganese monosul fide, were investigated in [2][3][4][5]. The results of the syn thesis of solid solutions of this system were for the first time published in [2].…”