| Autor: |
HB Hans Brom, Gert Jan Kramer, L.J. de Jongh |
| Přispěvatelé: |
Inorganic Materials & Catalysis, Soft Matter and Biological Physics |
| Rok vydání: |
1986 |
| Předmět: |
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| Zdroj: |
Physica B&C, 143(1-3), 521-523. North-Holland Publishing Company |
| ISSN: |
0378-4363 |
| DOI: |
10.1016/0378-4363(86)90185-3 |
| Popis: |
Substituted morpholinium TCNQ 2 compounds exhibit some universal features with respect to the field, frequency and temperature dependence of the conductivity. These characteristics are different from the closely related morpholinium TCNQ 1 compounds. We show that a natural way to account for these phenomena comes about by careful examination of the order parameter space, i.e. the space created by the two different order parameters which together determine the gap at the Fermi surface: (i) the regular Peierls dimerization of the acceptor-acceptor overlap and (ii) a coherent shift of the donor molecules with respect to the acceptors. By describing small revolutions through parameter space (realized by phase coupling of two different phonons producing the above mentioned gap) the ground state electron gas is shifted with respect to the lattice, thereby producing a current. The model allows for a qualitative description of conductivity-related phenomena in these systems. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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