Magnetic TTF-based charge-transfer complexes.

Misfit layer compounds : Structures and physical properties

Chalcogenide misfit layer compounds

Organic charge transfer complexes form a large variety of electronic structures from insulating state to metallic state in low-dimensional frameworks, which are governed by the competition between ...

Molecular magnets based on organic charge transfer complexes

Inrecent years of the work on misfit layer compounds has been devoted to thier characterization and crystal structure determination. Many structural investigations have been made using electron diffraction and high resolution electron microscopy. Most misfit compounds were found to be metallic and highly anisotropic; for some, occurrence of superconductivity (at very low temperatures, Tc < 6K) has also been detected.

Misfit layer compounds

Transport and magnetic properties of incommensurate layer compounds (RES)xVS2 (RE = RARE EARTHS)

Conduction mechanism and two-dimensional magnetism in incommensurate layered compounds (RES)xMS2 (RE=rare earth metal, M=Ta,V)

Physical properties of the 3d transition metal intercalates of incommensurate misfit layer compounds

Magnetic properties of incommensurate layered compounds (RES)xTS2 were investigated for RE=rare earth metals and T=Ta, V, Ti and Cr. The magnetic structures in the ordered states depend on the rare earth elements used; ferromagnetic layers with the moments normal to the layer are stacked antiferromagnetically for the Ce compounds, and antiferromagnetic layers with the moments parallel to the layer are stacked antiferromagnetically for the Gd compounds. (LaS)1.20CrS2 containing nonmagnetic La shows successive magnetic transitions at 70 and 40 K, while (CeS)1.20CrS2 shows magnetic transitions at 65 and 5 K. The 5 K transition is due to the magnetic ordering in the CeS layers, which occurs independently of the magnetic ordering in the CrS2 layers.

Variety of Magnetism in Incommensurate Misfit Layer Compounds (RES)xTS2 (RE=Rare Earths, T=Ta, V, Ti, Cr)

We investigated transport properties for incommensurate misfit layer compounds (CeS) 1.19 (TiS 2 ) n ( n =1,2) with stage-1 and stage-2 structures. Both materials showed metallic conduction. The Hall effect showed that the electrical conduction is dominated by the electron carriers for both compounds, while thermoelectric power of stage-1 (CeS) 1.19 TiS 2 had a positive value of +5 µV/K at room temperature. This proved that the two different energy bands overlap at E F of stage-1 (CeS) 1.19 TiS 2 . Detailed analysis of the thermoelectric power revealed the existence of short range domain-boundary phonon scattering process, where the mean free path is estimated to be of the order of 10 A. This means that the local-lattice modulation induced by the incommensurate structure has a remarkable effect on the scattering process of the acoustic phonons as well as the conduction electrons.

Tetsuo Kondo

Papers

Transport and magnetic properties of incommensurate layer compounds (RES)xVS2 (RE = RARE EARTHS)

Conduction mechanism and two-dimensional magnetism in incommensurate layered compounds (RES)xMS2 (RE=rare earth metal, M=Ta,V)

Physical properties of the 3d transition metal intercalates of incommensurate misfit layer compounds

Variety of Magnetism in Incommensurate Misfit Layer Compounds (RES)xTS2 (RE=Rare Earths, T=Ta, V, Ti, Cr)

Conduction Properties of Incommensurate Misfit Layer Compounds (CeS)1.19(TiS2)n (n=1,2)