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Multistability in a BEDT-TTF based molecular conductor.

Elena Laukhina1, José Vidal-Gancedo, Vladimir Laukhin

  • 1Institut de Ciència de Materials de Barcelona (CSIC), Campus Universitari de Bellaterra, Spain. cun@icmab.es

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|March 27, 2003
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This study reveals that the organic conductor (BEDT-TTF)2Br1.3I1.1Cl0.6 exhibits unique phase transitions between semiconductor and metal states. These transitions occur at both high and low temperatures, with significant hysteresis and property changes.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Organic Electronics

Background:

  • Low-dimensional organic conductors exhibit complex phase behaviors.
  • Polymorphism in molecular solids can lead to diverse electronic properties.
  • (BEDT-TTF)2Br1.3I1.1Cl0.6 is a unique molecular solid with potential for tunable electronic states.

Purpose of the Study:

  • To investigate the crystalline polymorphism and phase transitions of (BEDT-TTF)2Br1.3I1.1Cl0.6.
  • To characterize the semiconductor-metal transitions and their temperature dependence.
  • To elucidate the role of intermolecular interactions in the observed polymorphism.

Main Methods:

  • dc-conductivity measurements
  • Electron Spin Resonance (ESR) spectroscopy
  • X-ray diffraction analysis
  • Ab initio calculations

Main Results:

  • The material exists in three polymorphic forms: alpha -, alpha "-, and beta '-phases.
  • Reversible semiconductor-metal phase transitions (alpha " <--> beta ') were observed at both low (< 185 K) and high (> 395 K) temperatures.
  • Alpha ' <--> alpha " phase transitions occurred at high temperatures, all exhibiting significant hysteresis and dramatic property changes.

Conclusions:

  • Dipole-dipole interactions are proposed as a key factor driving the rich polymorphism in this molecular solid.
  • The ability to access the metal-like beta '-phase at both low and high temperatures highlights its unique nature.
  • The observed phase transitions offer opportunities for developing novel organic electronic devices with tunable properties.