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

Abstract

Polycrystalline samples of MnIn2(1—z)Ga2zSe4 system were prepared by the melt and anneal technique. Low‐field measurements of magnetic susceptibility χ were made as a function of temperature in the range 2 to 300 K. Values of TN, the Nöel temperature, were obtained from the cusp in the χ versus T curves. The 1/χ versus T curves indicated that for 0 < z < 0.30, the Mn is randomly distributed over the cation sublattice and the compound MnIn2Se4 (z = 0) was found to be spin‐glass, with Tg = 2.75 K and θ = —94 K. The samples in the composition range 0.75 < z < 1.0 all showed an ordered distribution of Mn2+ ions on the cation sublattice and were antiferromagnetic showing ideal Curie‐Weiss behaviour, TN = 8 K and θ = —24 K.

2D spin glass MnIn2Se4: application of liquid-phase exfoliation to a layered structure with seven-atom-thick layers

“…Despite this relatively strong exchange coupling, the material does not exhibit AFM ordering, in agreement with the previous reports. 35–39 The lack of AFM ordering is explained both by the spin frustration, due to the triangular arrangement of Mn spins, and the antisite disorder of the Mn and In atoms. The AC susceptibility measurements revealed a frequency-dependent maximum in the temperature dependence of χ ′ (Fig.…”