Dielectric slowing down toward the magnetically ordered state in a polar conductor (EDT-TTFVO)2FeBr4

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  • Negishi Eiichi
    Physics Department, Graduate School of Science, Tohoku University
  • Yabuta Shun
    Physics Department, Graduate School of Science, Tohoku University
  • Toyota Naoki
    Physics Department, Graduate School of Science, Tohoku University
  • Matsumoto Takuya
    Department of Chemistry, Graduate School of Science, Osaka Prefecture University
  • Sugimoto Toyonari
    Department of Chemistry, Graduate School of Science, Osaka Prefecture University CREST, Japan Science and Technology Agency

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  • Dielectric Slowing Down toward the Magnetically Ordered State in a Polar Conductor (EDT-TTFVO)<SUB>2</SUB>FeBr<SUB>4</SUB>

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We have measured the dielectric response as a function of both frequency (f=0.3 Hz–100 kHz) and electric bias field for a quasi-one-dimensional, polar conductor (EDT-TTFVO)2FeBr4 undergoing a ferrimagnetic-like transition at TC∼0.9 K. Around T*=15 K, the dielectric constant at low f exhibits a peak that shifts to higher T at higher f, being reminiscent of relaxor ferroelectrics with glassy polarizations. Since this dielectric anomaly is also present in the nonmagnetic isostructural GaBr4 salt, the polarizations may be ascribed to both π and σ electrons localized on the polar donor. At TC<T<7 K, the complex dielectric constant clearly exhibits a Debye relaxation, and the relaxation time follows a critical behavior as (T−T0)−nτ (nτ=6.5) toward T0=0.75±0.15 K just very close to TC. This phenomenon of the dielectric-slowing-down toward the magnetically ordered state is discussed as a novel type of multifunctional coupling in the short-range ordered state between the possible electric polarization in the distorted tetrahedral anion and the centered d spin of 5/2, the latter of which, eventually at TC, may induce the magnetic order with π spins of 1/2 disproportionately localized on the polar donors.

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