Formation of nanoscale polarized clusters as precursors of electronic ferroelectricity probed by conductance noise spectroscopy

Jens Müller, Satoshi Iguchi, Hiromi Taniguchi, Takahiko Sasaki

研究成果: Article査読

抄録

We investigate the low-frequency charge-carrier dynamics of a molecular dimer-Mott insulator β′-(BEDT-TTF)2ICl2, where the freezing of charge fluctuations on the dimers gives rise to electronic ferroelectricity. We show that conductance fluctuation (noise) spectroscopy allows one to probe changes in the dielectric properties at elevated temperatures, where samples are even still in the conductive regime. Our results explain the formation of electric polarization states leading to glassy and relaxor-type ferroelectric behavior that is frequently observed in these systems. The onset of distinct two-level fluctuations and changes of the underlying 1/f-type noise indicate the formation of nanoscale polar regions, the dynamics of which depends on the applied electric fields. Conductance noise spectroscopy therefore is a suitable tool for investigating the onset of electric-polarization dynamics in molecular and other, inorganic charge-driven ferroelectrics.

本文言語English
論文番号100103
ジャーナルPhysical Review B
102
10
DOI
出版ステータスPublished - 2020 9

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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