engleski

Magneto-transport properties of Quasi-One-Dimensional Organic Conductors

The quasi-1D character of the electronic structure of organic conductors and superconductors is based on the anisotropy of the tight-binding overlap integrals along the three crystallographic directions. The interactions between charge, spin and lattice degrees of freedom result in a very rich phase diagram with various ground states. By modification of the organic molecules and/or the counter ions the relevant physical parameters like overlap integrals, the Coulomb interactions or band filling can be varied allowing the exploration of the phenomena of one-dimensional physics. I will present our comparative study of the electric and galvanomagnetic properties of several organic conductors and superconductors with a focus on (TMTCF)2X (C= Se, S) compounds.1, 2 Their phase diagram spanning from more anisotropic C = S to C = Se series shows the increasing interchain coupling that leads to the crossing-over of the dimensionality from 1D→ 2D (3D). Our results on temperature and magnetic field dependence of conductivity anisotropy, Hall effect and magnetoresistance (up to room temperature, and in magnetic fields up to 9T) enabled us to gain information about Fermi liquid or Luttinger liquid behavior at high temperatures, possible dimensional crossover, phase transitions, non-linear conductivity etc. The results are discussed in the framework of the existing theoretical models. The evidence that the 1D Luttinger liquid features appear in the transport properties at high temperatures in C=S series will be addressed as well as the strong evidence for charge ordering transition from transport measurements.2 1 B. Korin-Hamzić, E. Tafra, M. Basletić, A. Hamzić, G. Untereiner and M. Dressel, Phys. Rev. B 67, 014513 (2003) 2 B. Korin-Hamzić, E. Tafra, M. Basletić, A. Hamzić and M. Dressel, Phys. Rev. B 73, 115102 (2006)

organic conductors and superconductors; electric and galvanomagnetic properties

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