Visualization of a nonlinear conducting path in an organic molecular ferroelectric by using emission of terahertz radiation
Visualization of a nonlinear conducting path in an organic molecular ferroelectric by using emission of terahertz radiation
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利用太赫兹辐射的发射对有机分子铁电体中的非线性导电路径进行可视化
DOI:
10.1103/physrevb.95.241102
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发表时间:
2017
影响因子:
3.7
通讯作者:
Okamoto H.
中科院分区:
文献类型:
--
作者:
Sotome M.;Kida N.;Kinoshita Y.;Yamakawa H.;Miyamoto T.;Mori H.;Okamoto H.
Nonlinear electric transport and switching to a negative resistance state are typical electric-field-induced phenomena in correlated electron materials, while their mechanisms are generally difficult to solve. In the present study, we apply the terahertz-radiation imaging method to an organic molecular ferroelectric, α-type bis(ethylenedithio)tetrathiafulvalene iodide salt, and investigate the nature of its negative resistance phenomenon. When the negative resistance state is produced, the ferroelectric order is melted in an elongated region with the width of ∼100 μm and that region grows along the direction inclined by about 40° from theaxis with the increase of nonlinear current. A comparison of the terahertz radiation intensity with the current magnitude revealed that the melted region forms a conducting path. We interpreted the diagonal growth of the conduction path by taking into account the anisotropy of the intermolecular transfer integrals.
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10.18419/opus-4871
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1994
期刊:
Journal De Physique I
影响因子:
--
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