Peierls structural transition of TTF-TCNQ organic crystals in the 2D physical model
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2023-07-18 16:54
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ANDRONIC, Silvia, BALMUŞ, Ion, KASIYAN, Anatolie. Peierls structural transition of TTF-TCNQ organic crystals in the 2D physical model. In: Microelectronics and Computer Science: The 5th International Conference, Ed. 8, 22-25 octombrie 2014, Chisinau. Chișinău, Republica Moldova: Universitatea Tehnică a Moldovei, 2014, Ediția 8, pp. 16-19. ISBN 978-9975-45-329-5..
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Microelectronics and Computer Science
Ediția 8, 2014
Conferința "Microelectronics and Computer Science"
8, Chisinau, Moldova, 22-25 octombrie 2014

Peierls structural transition of TTF-TCNQ organic crystals in the 2D physical model


Pag. 16-19

Andronic Silvia, Balmuş Ion, Kasiyan Anatolie
 
Technical University of Moldova
 
Proiecte:
 
Disponibil în IBN: 10 aprilie 2019


Rezumat

Many quasi-one-dimensional (Q1D) organic crystals, known as synthetic metals at room temperature, become insulators when the temperature decreases, due to the Peierls transition. In the last years, it was demonstrated theoretically, that after the optimization of parameters, the organic crystals of TTF-TCNQ (tetrathiofulvalene-tetracyanoquinodimethane) are good candidates for thermoelectric materials. Peierls transition in Q1D crystals of TTF-TCNQ type is studied in a 2D physical model of the crystal. There are considered two the most important electron-phonon interactions. The equation for phonon Green function is deduced in the random phase approximation as a sum of diagrammatic ladder series of close loops of electronic Green functions. The polarization operator as a function of temperature is calculated for different values of the parameter δ, where δ is the increase of the Fermi momentum, kF , that is determined by the increase of carrier concentration. The Peierls critical temperature Tp was determined for different values of δ.

Cuvinte-cheie
Peierls transition, tetrathiofulvalene-tetracyanoquinodimethane, polarization operator, phonon Green function, Peierls critical temperature.