LAUSR

Abstract Magnetic properties of intermetallic MnMn0.25Sb crystallizing in the NiAs-type hexagonal structure are reported. A spin-glass transition at Tf ≈ 10.7 K was identified from Ac susceptibility measurements. The value of the Mydosh parameter ( φ ≈ 0.06 ) . was further indicative of cluster spin glass like state. The frequency dependence of Tf was investigated by critical slowing-down model and Vogel-Fulcher law. The characteristic time constant of τ 0 ∗ ≈ 0.18 × 10 − 7 s was analysed using power-law for a single spin-flip and a critical exponent of z v = 4.37 ± 0.14 . The characteristic time constant was obtained from the Vogel-Fulcher law for a single spin-flip τ 0 ≈ 7.96 × 10 − 8 s , and T 0 = 6.49 ± 0.21 K . The cluster spin-glass behaviour in the current system is due to the existence of both competing interactions and atomic disorder at 2d site.