Critical Behaviour and Critical Exponents in ZnxCd1?xCr2Se4 Compounds (0.35 ? x ? 0.45)

Critical Properties of the Magnetically Disordered B-Spinel ZnxCd1-xCr2Se4 (0.35 ?x ? 0.58)

“…The experimental values of T C are estimated by the scaling plot method [2,7]. The variation of T C with x is linear and confirms the result of Baltzer et al [14].…”

“…The calculations are done under the assumption that exchange is different from zero only for nearest (nn), next-nearest (nnn) and third nearest neighbours (tnn) with exchange integrals J 1 , J 2 and J 3 , respectively [7,8].…”

“…In a previous paper [7], the interest is given to the critical behaviour of the system Zn x Cd 1± ±x Cr 2 Se 4 in the range of concentration 0.35 x 0.45. In this paper, we extend the investigations up to x = 0.58.…”

“…The experimental conditions and the preparation of the compounds have been described elsewhere [2,7].…”

Magnetic structure and phase diagram of the frustrated spinel Cd1−xZnxCr2Se4

“…A preliminary magnetic phase diagram has been proposed [15] and no evidence of paramagnetic to spinglass transition appears in the region 0.4oxo0.6 but rather a perturbed order occurs for 0.5oxo0.6. Using the mean field theory and the spin wave theory, the exchange integrals for x ¼ 0.35, 0.41 and 0.45 were calculated to the third nearest neighbours [16,17]. A critical analysis has been performed on the samples x ¼ 0.35, 0.45 and 0.55.…”