LANDAU THEORY OF PHASE TRANSITIONS IN TTF-TCNQ.

C. Hartzstein; V. Zevin; M. Weger

doi:10.1051/jphys:01980004107067700

LANDAU THEORY OF PHASE TRANSITIONS IN TTF-TCNQ.

C. Hartzstein^*, V. Zevin, M. Weger

^*Corresponding author for this work

Racah Institute of Physics

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

Several parameters of the Landau Free Energy Function of TTF-TCNQ are calculated from the crystal structure taking into account the atomic positions and realistic charge distributions. In particular, the parameters that determine the coupling between charge density waves and rotations (librons) on neighbouring chains are evaluated. The Free Energy Function is solved, and good agreement with the experimental observation of the 2 a period between 53 K and 48 K and its variation below this temperature, is obtained. The CDW-libron interaction seems to be responsible for this transverse period. The behavior of C//p in the vicinity of the two close phase transitions is studied. The Free Energy should possess several (up to four) Lifshitz points, for appropriate values of the parameters.

Original language	English
Pages (from-to)	677-699
Number of pages	23
Journal	Journal De Physique
Volume	41
Issue number	7
DOIs	https://doi.org/10.1051/jphys:01980004107067700
State	Published - 1980

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title = "LANDAU THEORY OF PHASE TRANSITIONS IN TTF-TCNQ.",

abstract = "Several parameters of the Landau Free Energy Function of TTF-TCNQ are calculated from the crystal structure taking into account the atomic positions and realistic charge distributions. In particular, the parameters that determine the coupling between charge density waves and rotations (librons) on neighbouring chains are evaluated. The Free Energy Function is solved, and good agreement with the experimental observation of the 2 a period between 53 K and 48 K and its variation below this temperature, is obtained. The CDW-libron interaction seems to be responsible for this transverse period. The behavior of C//p in the vicinity of the two close phase transitions is studied. The Free Energy should possess several (up to four) Lifshitz points, for appropriate values of the parameters.",

author = "C. Hartzstein and V. Zevin and M. Weger",

year = "1980",

doi = "10.1051/jphys:01980004107067700",

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T1 - LANDAU THEORY OF PHASE TRANSITIONS IN TTF-TCNQ.

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AU - Zevin, V.

AU - Weger, M.

PY - 1980

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N2 - Several parameters of the Landau Free Energy Function of TTF-TCNQ are calculated from the crystal structure taking into account the atomic positions and realistic charge distributions. In particular, the parameters that determine the coupling between charge density waves and rotations (librons) on neighbouring chains are evaluated. The Free Energy Function is solved, and good agreement with the experimental observation of the 2 a period between 53 K and 48 K and its variation below this temperature, is obtained. The CDW-libron interaction seems to be responsible for this transverse period. The behavior of C//p in the vicinity of the two close phase transitions is studied. The Free Energy should possess several (up to four) Lifshitz points, for appropriate values of the parameters.

AB - Several parameters of the Landau Free Energy Function of TTF-TCNQ are calculated from the crystal structure taking into account the atomic positions and realistic charge distributions. In particular, the parameters that determine the coupling between charge density waves and rotations (librons) on neighbouring chains are evaluated. The Free Energy Function is solved, and good agreement with the experimental observation of the 2 a period between 53 K and 48 K and its variation below this temperature, is obtained. The CDW-libron interaction seems to be responsible for this transverse period. The behavior of C//p in the vicinity of the two close phase transitions is studied. The Free Energy should possess several (up to four) Lifshitz points, for appropriate values of the parameters.

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LANDAU THEORY OF PHASE TRANSITIONS IN TTF-TCNQ.

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