Abstract
The unharmonic effects on the resistivity, caused by electron-libron scattering, are estimated using a Lennard-Jones potential. Very good agreement with experiment is obtained. The observed differences between constant volume and constant pressure resistivities are accounted for. It is predicted that the variation of conductivity with lattice compression should decrease at high temperatures.
| Original language | English |
|---|---|
| Pages (from-to) | 53-56 |
| Number of pages | 4 |
| Journal | Solid State Communications |
| Volume | 27 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jul 1978 |
Bibliographical note
Funding Information:THE UNUSUAL PROPERTIES of the charge-transfer complex TTF-TCNQ (tetrathiofulvalene- tetraeyanoquinodimetane) and analogous high-conductivity materials like HMTSF-TCNQ (hexamethyl-tetraselenafulvalene-TCNQ), have attracted a large degree of attention and a variety of theories exist to account for them, most of which are described in three Proceedings volumes \[1-3\].T he electronic properties of these materials, such as the electrical conductivity, magnetic susceptibility, etc., depend strongly on pressure, several orders stronger than in ordinary metals. This pressure dependence,which was discovered at a rather early stage of activity in this field \[4, 5\], has not received much attention, yet it can serve as a critical test for the various theories. The strong pressure dependence intimately involves the lattice anharmonicities, which have not yet been considered in detail, although some pioneering work revealing strong lattice anharmonicities in these materials exists \[6, 7\]. Another indication for the existence of strong lattice anharmonicities is the large difference between the electronic properties at constant volume and constant pressure. Cooper~and Jerome \[8\] have recently pointed out the importance of distinguishing between constant volume and constant pressure resistivities in TTF-TCNQ. The constant volume resistivity can be derived from the thermal expansion ~f Permanent address. * This research was supported by a grant from the National Council for Research and Development, Israel and the KfK (Kernforschungszentrum, Karlsruhe GmbH), Germany.
Funding
THE UNUSUAL PROPERTIES of the charge-transfer complex TTF-TCNQ (tetrathiofulvalene- tetraeyanoquinodimetane) and analogous high-conductivity materials like HMTSF-TCNQ (hexamethyl-tetraselenafulvalene-TCNQ), have attracted a large degree of attention and a variety of theories exist to account for them, most of which are described in three Proceedings volumes \[1-3\].T he electronic properties of these materials, such as the electrical conductivity, magnetic susceptibility, etc., depend strongly on pressure, several orders stronger than in ordinary metals. This pressure dependence,which was discovered at a rather early stage of activity in this field \[4, 5\], has not received much attention, yet it can serve as a critical test for the various theories. The strong pressure dependence intimately involves the lattice anharmonicities, which have not yet been considered in detail, although some pioneering work revealing strong lattice anharmonicities in these materials exists \[6, 7\]. Another indication for the existence of strong lattice anharmonicities is the large difference between the electronic properties at constant volume and constant pressure. Cooper~and Jerome \[8\] have recently pointed out the importance of distinguishing between constant volume and constant pressure resistivities in TTF-TCNQ. The constant volume resistivity can be derived from the thermal expansion ~f Permanent address. * This research was supported by a grant from the National Council for Research and Development, Israel and the KfK (Kernforschungszentrum, Karlsruhe GmbH), Germany.
| Funders | Funder number |
|---|---|
| National Council for Forest Research and Development |