Spin-glass ordering in Zn 1¿x Mn x In 2 Te 4 diluted magnetic semiconductor

摘要: We present a study of the magnetic properties ${\mathrm{Zn}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}{\mathrm{In}}_{2}{\mathrm{Te}}_{4}$ diluted semiconductor for concentrations $0.3l~xl~1.0.$ Samples with $xl~0.5$ displayed paramagnetic behavior down to lowest experimental temperature (1.8 K), whereas spin-glass transition was observed $xg0.5$ at temperatures $2.5 \mathrm{K}l~Tl~3.8 \mathrm{K},$ depending on $\mathrm{Mn}$ content. The effective moment ${\ensuremath{\mu}}_{\mathrm{eff}}=5.80(2){\ensuremath{\mu}}_{B},$ calculated from high-temperature susceptibility, corresponds ${3d}^{5}$ $(S=\frac{5}{2})$ configuration ${\mathrm{Mn}}^{2+}.$ For sample composition $x=0.9,$ in-phase component ac susceptibility has been analyzed according conventional power-law dynamics, obtaining freezing ${T}_{f}=3.1(2) \mathrm{K}$ and critical exponent $z\ensuremath{\nu}=10.3\ifmmode\pm\else\textpm\fi{}2.$ Low-field dc data show sharp peak $\ensuremath{\sim}3.3 below which strong irreversibility is between zero-field-cooled field-cooled states. Evidence true phase-transition phenomenon given by steep increase nonlinear ${\ensuremath{\chi}}_{\mathrm{nl}}$ when approaching ${T}_{f}$ above. A static scaling yielded values $\ensuremath{\beta}=0.9(1)$ $\ensuremath{\gamma}=3.6(4)$ exponents, gave also proper asymptotic function. These are in good agreement reported other spin-glasses such as ${M}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{Te}$ $(M=\mathrm{Zn},$ Cd, Hg), constitute evidence three-dimensional ${\mathrm{Zn}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}{\mathrm{In}}_{2}{\mathrm{Te}}_{4}.$