Biennial Report 2005-2007 - Saha Institute of Nuclear Physics

Condensed Matter Physics 121( -cm)10 8 0.80.710 610 410 210 010 -210 -40.60.50.40.30.20.1Sr 2Fe 1-xMn xMoO 60 50 100 150 200 250 300Temperature (K)Fig.4.1.1.32: Temperature dependence of resistivity [ρ(T)] of Sr 2 Fe 1−x Mn x MoO 6 forx=0.1,0.2, 0.3, 0.4, 0.5, 0.6, 0.7 & 0.8Our result is consistent with the variable range hoping (VRH) mechanism, where the Mott temperaturerises rapidly with increase in x indicating the rapid change of localization process. Thermopowerresults suggest that the nature of conduction is electronic in nature.Chandan Mazumdar, Asok PoddarECMP4.1.1.33 Transport and magnetic properties of nanocrystalline Sr 2 FeMoO 6We have studied transport and magnetic properties of nanocrystalline Sr 2 FeMoO 6 of various sizes.Resistivity behaviour found to vary systematically with particle size and can be explained in thetemperature range 4-300K through a model involving quantum interference effect.Chandan Mazumdar, Asok Poddar, N Das†, B Chattopadhyay†ECMP4.1.1.34 Studies of transport and magnetic properties of Ca 2 Fe 1−x Co x MoO 6(0≤x≤0.4)We have studied the transport and magnetic properties of Ca 2 Fe 1−x Co x MoO 6 (0≤x≤0.4) system.All the materials exhibit metallic behaviour. The ferromagnetic Curie temperature reduces with