Magnetic properties of the In-doped MnWO4-type solid solutions Mn1-3xIn2x□xWO4 [□=vacancy; 0 ≤ x ≤ 0.11]

Polycrystalline Mn1-3xIn2x square xWO4 [square=vacancy; 0 <= x <= 0.11] solid solutions synthesized via solid state reactions were characterized by means of magnetic ac susceptibility (chi(AC)) and specific heat (C). The effect of this substitution On the magnetic transition temperatures give rise to three consequences: (1) the disappearance of the basic antiferromagnetic (AFM) phase AF1 when exceeding the doping concentration x=0.03; (2) the phase transition of the paramagnetic phase (PM) to the sinusoidal AFM phase AF3 at the Neel temperature (T-N) is shifted toward lower temperatures with respect to pure MnWO4. This is valid also for the transition of AF3 to the cycloiclal AFM phase AF2; (3) a systematic lowering of the effective magnetic moment with increasing In-doping. These substantial changes are attributed to the weakened overall magnetic interaction and a strong spin-lattice coupling clue to the static disorder of Mn2+ with the nonmagnetic species, i.e. In3+ and vacancy. (C) 2015 Elsevier B.V. All rights reserved