Physical Properties of The 3d Transition Metal Intercalates of Misfit Layer Compounds (LaS)_1.14[M_x(NbS₂)₂] (M = Mn, Fe, Co)

抄録

The pseudo two-dimensional (2D) magnetic systems (LaS)_1.14[M_x(NbS₂)₂] (M = Mn, Fe, Co) were synthesized for the first time, and their magnetic and transport properties were investigated. (LaS)_1.14[M_x(NbS₂)₂] show three-dimensional (3D) magnetic transitions at 4.4, 6.2 and 15 K for M = Mn, Co and Fe, respectively. The 3D transition temperatures are lowered by the quasi-2D magnetic property brought about the insertion of the extra layer LaS to the layered magnets M_xNbS₂, and the 2D short-range order effects are observed in the heat capacity at much higher than the transition temperatures. The minimum behavior of ρ and the maximum behavior of R_H appear in the low temperatures. We consider that the weak localization in the quasi-2D transport system causes the anomalous behaviors of the transport properties.