Experimental evidence of the spin-glass transition in the diluted magnetic semiconductor Zn_1−xMn_xIn₂Se₄

Abstract

This work reports on magnetic measurements of the quasi-two-dimensional (quasi-2D) system Zn 1−x Mn x In 2 Se 4 , with 0.01 x 1.00. For x > 0.67, the quasi-2D system seems to develop a spin-glass behaviour. Evidence of a true phase transition phenomenon is provided by the steep increase of the nonlinear susceptibility χ nl when approaching T C from above. The static scaling of χ nl data yields critical exponents δ = 4.0 ± 0.2, φ = 4.37 ± 0.17 and T C = 3.4 ± 0.1 K for the sample with x = 1.00 and similar values for the sample with x = 0.87. These critical exponents are in good agreement with values reported for other spin-glass systems with short-range interactions.

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][36][37][38][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 w 0 (Fig.…”