Spectroscopy of the Peierls transition order parameter in the quasi-one-dimensional organic conductor (FA)(2)PF6

Autor:	K. Widder, Hans Peter Geserich, D. Berner, Markus Schwoerer, Victor M. Burlakov, J. Gmeiner, G. Scheiber
Rok vydání:	2016
Předmět:	Phase transition Condensed matter physics Tricritical point Phonon Chemistry Peierls transition Phase (matter) Materials Chemistry General Chemistry Atmospheric temperature range Condensed Matter Physics Spectroscopy Optical conductivity
Popis:	The broad band spectrum of the optical conductivity of the quasi-one dimensional organic conductor (FA) 2 PF 6 (FA = fluoranthene) has been investigated in a wide temperature range including the Peierls transition temperature T p = 180 K. A semiconducting gap has been observed both below and above T p varying between 150 meV at 10 K and 80 meV at 300 K. The (T p − T) 1 4 temperature dependence for the order parameter has been deduced from an analysis of the integrated band intensity of phase phonons thus giving evidence that the Peierls transition is a 2nd order phase transition near the tricritical point.
Databáze:	OpenAIRE
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