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    |July 26, 2016
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    An applied electric field partially dissolves the charge-order phase in β-(BEDT-TTF)2PF6, shifting the metal-insulator transition temperature. This effect, observed in field-effect transistors, highlights electrical control over charge order.

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    Area of Science:

    • Condensed matter physics
    • Materials science
    • Organic electronics

    Background:

    • Charge-order phases are crucial in organic conductors like β-(BEDT-TTF)2PF6.
    • Understanding the influence of external fields on these phases is key for electronic device applications.
    • Previous studies have explored charge order, but control via electric fields at room temperature remains an active research area.

    Purpose of the Study:

    • To investigate the effect of an applied gate electric field on the charge-order phase in β-(BEDT-TTF)2PF6 single-crystal field-effect transistors.
    • To analyze the temperature dependence of electrical conductance under gate electric field modulation.
    • To determine the impact of the electric field on the metal-insulator transition temperature (TMI) and the charge-order phase.

    Main Methods:

    • Fabrication of β-(BEDT-TTF)2PF6 single-crystal field-effect transistor structures.
    • Advanced sample preparation and precise electrical measurement techniques.
    • Application of a gate electric field and monitoring of electrical conductance and its temperature dependence around TMI.

    Main Results:

    • A systematic increase in electrical conductance was observed with the applied gate electric field near TMI.
    • The metal-insulator transition temperature (TMI) was found to shift to lower temperatures upon gate electric field application.
    • The applied electric field was shown to induce a partial dissolution of the charge-order phase, with the affected region significantly larger than the charge accumulation region.

    Conclusions:

    • Gate electric field application can effectively modulate and partially suppress the charge-order phase in β-(BEDT-TTF)2PF6.
    • This electrical control over charge order offers potential for tuning the electronic properties of organic conductors.
    • The findings demonstrate a pathway for developing novel electronic devices based on field-effect control of charge-ordered states.