Journal
PHYSICAL REVIEW B
Volume 81, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.155111
Keywords
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Funding
- Ministry of Education, Science and Culture, Japan [20110005, 20340069]
- Grants-in-Aid for Scientific Research [22550134, 20340069] Funding Source: KAKEN
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The thermal and photoinduced phase transitions between the ferroelectric charge-ordered (CO) insulator state and the metallic state in the layered organic salt alpha-(ET)(2)I-3 (ET: [bis(ethylenedithio)]-tetrathiafulvalene) were investigated using terahertz time-domain spectroscopy. Characteristic increases were observed in the optical conductivity and the dielectric constant upon increasing the temperature to just below the insulator-to-metal transition temperature (T-CO), which reflects the partial or precursory collapse of the ferroelectric state and charge ordering. The excitation of this partially melted CO state near T-CO led to the formation of a photoinduced macroscopic metallic state, whose conductivity appeared to be greater than that of a high-temperature metallic state. At T << T-CO, a microscopic metallic state was formed within the rigid CO state.
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