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首页> 外文期刊>Zeitschrift fur Physik, B. Condensed Matter >Low frequency dielectric permittivity of quasi-one dimensional conductor (TMTTF)_2Br
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Low frequency dielectric permittivity of quasi-one dimensional conductor (TMTTF)_2Br

机译：准一维导体（TMTTF）_2Br的低频介电常数

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摘要

Conductivity and permittivity ∈ of the organic transfer salt (TMTTF)_2Br have been measured at low frequencies (10~2-10~7 Hz) between room temperature down to 4 K. The real part of the permittivity, ∈', is shown to grow below the temperature T_ρ at which the conductivity is maximum due to charge localization of Mott-Hubbard type. ∈' reaches a maximum of 10~5-10~6 at 35 K-50 K depending on the samples. Decreasing temperature below T_ρ, ∈' sharply decreases down to helium temperature through the antiferromagnetic phase transition at T_N = 15 K. We explain the magnitude, the temperature and frequency dependence of ∈' as resulting from short range charge density wave states in the temperature range where charge localization occurs. This interpretation is supported by recent X-ray scattering measurements.
机译：在室温至低至4 K的低频（10〜2-10〜7 Hz）下测量了有机转移盐（TMTTF）_2Br的电导率和介电常数ε。由于Mott-Hubbard型电荷的局域化，在低于电导率最大的温度T_ρ时生长。 ε'在35 K-50 K时最大取决于样本，为10〜5-10〜6。将温度降低到T_ρ以下，ε'通过T_N = 15 K时的反铁磁相变而急剧下降到氦气温度。我们解释ε'的大小，温度和频率依赖性，这是由温度范围内的短距离电荷密度波状态引起的发生电荷本地化的地方。最近的X射线散射测量结果支持了这种解释。

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