High-pressure synthesis of a new ferromagnetic compound, CrGa2Sb2

Survey of new materials by solid state synthesis under external fields: high-pressure synthesis and microwave processing of inorganic materials

“…However, a new intermediate phase (¾-Ag 3 Ge), that can be regarded as the Hume-Rothery phase, appeared at elevated pressure (47 GPa). 6) In our study, four new manganese germanides, Mn 3 Ge, 7) MnGe, 8 17) were successfully synthesized under highpressure condition. It is also notable that, through these synthetic studies, we found the general tendency that the formation of new phase under high-pressure easily occurs at the composition near the eutectic point in the equilibrium phase diagram at ambient pressure condition.…”

“…Pressure-induced structural phase transitions in transition metal dipnictides and dichalcogenides. 17) Mn 3 Ge (T C = 400 K), 7) Mn 3 Sb (T C µ 200 K), 15) MnGe 4 (T C = 340 K), 9) and MnGa 2 Sb 2 (T C = 310 K), 16) have been successfully synthesized and their structure and magnetic properties have been characterized. Among these compounds, MnGe 4 and its analogues, MnGa 2 Sb 2 and CrGa 2 Sb 2 , make a unique class of materials composed of one-dimensional linear chain of magnetic atoms.…”

First-principles study of electronic structure and magnetic properties of orthorhombic CrGa2Sb2 and MnGa2Sb2

“…[6,8] (with the difference of 0.01e0.02 m B ). The experimental saturation magnetic moments, extrapolated to 0 K, were 1.6 m B /Cr [4] and 1.47 m B /Mn [3] for CrGa 2 Sb 2 and MnGa 2 Sb 2 , respectively, above the Curie temperature, the paramagnetic moments were 2.43 m B /Cr [4] and 3.2 m B /Mn [3]. The measurement reveals that the samples of CrGa 2 Sb 2 and MnGa 2 Sb 2 contain about 4% Cr [4] and 6% Mn [3] deficiency, respectively.…”

“…This intermetallic compound exhibits the itinerant-electron ferromagnetic property with a high Curie temperature of 310 K and metallic conductivity. Later, the isostructural analogue CrGa 2 Sb 2 was synthesized by the same high pressure and high temperature method, which also has the ferromagnetic behavior and the high Curie temperature above room-temperature (345 K) [4,5]. Furthermore, the electrical resistance measurement shows CrGa 2 Sb 2 displays a semiconductor behavior [5], the combination of ferromagnetic and semiconducting properties is potentially promising for the spintronic applications.…”

Magnetoresistance of the high-pressure ferromagnetic phases (GaSb)2M (M=Cr,Mn)

“…Interesting to note, that in the phase diagram of Cr-Si, for example, there is no thermodynamically stable phases with composition 1:4 [11], similar to the (GaSb) 2 M, so these compounds recovered from the high pressure are likely to be metastable at the ambient pressure. It was previously shown that both these phases (GaSb) 2 Mn and (GaSb) 2 Cr are ferromagnetic with T C ≈ 300 and 360 K respectively [3,4,5,2,6,7]. In the former case Curie temperature significantly depends on Mn content [4], so small deviation from stochiometry can lead to significant lowering of the critical temperature, the effect which is not observed in (GaSb) 2 Cr.…”