Cu2(1 − z)Mnzln2Se4 alloys; phase diagram and effects of Mn ordering on magnetic behaviour

Magnetic Behaviour for the MnIn2(1—z)Ga2zSe4 Alloys

“…1a, for a sample with z = 0.9, shows a linear 1/c variation with T over the complete range investigated, with a Curie-Weiss q value of À24 K. The curve in Fig. However, as was shown previously [4,8,9] for alloys of similar phase diagrams, the values of the Curie-Weiss constant q determined from magnetic measurements give a good indication of the ordering of the Mn atoms in the lattice. In this case extrapolation of the linear region of the curve gave a value of q of about À100 K. Analysis and Discussion As indicated above, at low temperatures two single-phase solid fields occur.…”

Crystal growth and characterization of MnIn2−2x Ga2x Se4

“…The crystal structure of these compounds has been studied by several researchers [5,6]. It has been found that MnGa 2 Se 4 has a defect tetragonal A: In the present work, we report on the growth of single crystals as well as on the structural, optical and magnetic characterization of the mixed compounds MnIn 2À2x Ga 2x Se 4 .…”

The fundamental absorption edge in MnIn2Se4 layer semi-magnetic semiconductor

“…These OVC's exist in different crystal structures and display semiconducting properties, show a broad range of band gaps, form mutual solid solutions and manifest several interesting optical and structural properties associated with the crystallographic ordered array of vacancies [3][4][5]. Among these materials the semi-magnetic semiconductors Mn III 2 B VI 4 C have also received considerable attention [12][13][14][15][16][17][18][19][20][21][22][23]. This is mainly because of the presence of magnetic Mn +2 ions which make these compounds of considerable interest from the point of view of their magneto-optical properties.…”

“…This is mainly because of the presence of magnetic Mn +2 ions which make these compounds of considerable interest from the point of view of their magneto-optical properties. Thus, magnetic properties of MnIn 2 Se 4 , MnIn 2 Te 4 , MnGa 2 Se 4 , MnIn 2 S 4 and its alloys have been studied in detail for several authors [15][16][17][18][19][20][21]. MnIn 2 Se 4 crystallizes in a rhombohedral structure with space group R 3 m [22] and consists of slabs of four Se layers which are van der Waals coupled to each other; within the slabs the Mn and In atoms are distributed over three triangular layers between the Se layers in a tetrahedral-octahedral-tetrahedral site sequence.…”

“…Also, there is a disordered distribution of the metal atoms in a quasi-twodimensional cation sublattice. Measurements of magnetic susceptibility as a function of temperature in this compound show antiferromagnetic behavior with paramagnetic Curie temperature of about -96 K and the formation of spin-glass-like phase below 3.5 K [15][16][17][18][19].…”