The metal-insulator transition in the organic conductor β″-(BEDT-TTF)2Hg(SCN)2Cl

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  • Weiwu Li
    1. Physikalisches Institut, Universität Stuttgart 1 , Pfaffenwaldring 57, 70550 Stuttgart, Germany
  • Eva Rose
    1. Physikalisches Institut, Universität Stuttgart 1 , Pfaffenwaldring 57, 70550 Stuttgart, Germany
  • Minh Vu Tran
    1. Physikalisches Institut, Universität Stuttgart 1 , Pfaffenwaldring 57, 70550 Stuttgart, Germany
  • Ralph Hübner
    1. Physikalisches Institut, Universität Stuttgart 1 , Pfaffenwaldring 57, 70550 Stuttgart, Germany
  • Andrzej Łapiński
    Institute of Molecular Physics, Polish Academy of Sciences 2 , Smoluchowskiego 17, 60-179 Poznań, Poland
  • Roman Świetlik
    Institute of Molecular Physics, Polish Academy of Sciences 2 , Smoluchowskiego 17, 60-179 Poznań, Poland
  • Svetlana A. Torunova
    Institute of Problems of Chemical Physics, Russian Academy of Sciences 3 , 142 432 Chernogolovka, Russia
  • Elena I. Zhilyaeva
    Institute of Problems of Chemical Physics, Russian Academy of Sciences 3 , 142 432 Chernogolovka, Russia
  • Rimma N. Lyubovskaya
    Institute of Problems of Chemical Physics, Russian Academy of Sciences 3 , 142 432 Chernogolovka, Russia
  • Martin Dressel
    1. Physikalisches Institut, Universität Stuttgart 1 , Pfaffenwaldring 57, 70550 Stuttgart, Germany

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<jats:p>We explore the nature of the metal-insulator transition in the two-dimensional organic compound β″-(BEDT-TTF)2Hg(SCN)2Cl by x-ray, electrical transport, ESR, Raman, and infrared investigations. Magnetic and vibrational spectroscopy concurrently reveal a gradual dimerization along the stacking direction (a−b), setting in already at the crossover temperature of 150 K from the metallic to the insulating state. A spin gap of Δσ=47 meV is extracted. From the activated resistivity behavior below T = 55 K, a charge gap of Δρ=60 meV is derived. At TCO = 72 K, the C=C vibrational modes reveal the development of a charge-ordered state with a charge disproportionation of 2δρ=0.34e. In addition to a slight structural dimerization, charge-order causes stripes most likely perpendicular to the stacks.</jats:p>

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