Optical phonon drag and variable range hopping mechanisms of thermoelectric power generation in charge density wave system o-TaS₃

2014/08/26 by D. Starešinić, M. Očko, Starešinić, D. +5
Physics and Astronomy · #FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.str-el

paper · pdf · doi:10.48550/arxiv.1408.6190

submitted to PRL

arxiv created 2014/08/26 · arxiv updated 2016/08/10

Abstract

We have measured the thermoelectric power of charge density wave system o-TaS₃ in a wide temperature range between 10 K and 300 K. All features characteristic for charge density wave systems have been observed; strong increase below charge density transition temperature T_P, peak at T_M∼1/2-1/3 T_P and change of sign at lower temperatures. These features can be explained by two contributions; free carriers drag by the optical phonons with frequencies close to the density wave gap value in the peak region and above, and hopping of localized carriers of opposite charge to free carriers at low temperatures. We argue that these are common mechanisms of thermoelectric power generation in all charge density wave systems.

Related

• Phonon-Drag Thermopower at High Temperatures
• Phonon drag of electrons at high temperatures
• Thermal transport properties of a charge density wave
• Low Effective Mass Leading to High Thermoelectric Performance
• Thermoelectric cooling and thermal switching via the non-linear phonon Peltier effect