Down to the quantum limit at the neutral-to-ionic phase transition of (BEDT-TTF)-(ClMe-TCNQ): Symmetry analysis and phase diagram

作者：Lemee Cailleau M H^*; Collet E; Buron Le Cointe M; Grach N; Ouladdiaf B; Moussa F; Hasegawa T; Takahashi Y; Roisnel T; Cailleau H

来源：Journal of Physical Chemistry B, 2007, 111(22): 6167-6172.

DOI：10.1021/jp0671291

We report on the neutral-to-ionic (N-I) phase transition in the one-dimensional organic complex (BEDT-TTF)-(ClMeTCNQ). The X-ray studies at room temperature show that the neutral phase of (BEDT-TTF)-(ClMeTCNQ) is already characterized by a polar long-range ordering, at variance with other charge-transfer compounds comprising noncentrosymmetric molecules. From a detailed neutron diffraction study of this complex under high pressure, we present the phase diagram of the N-I transition down to the quantum limit. We discuss the symmetry breaking associated with the transition and the evolution of its first-order character under pressure.

• 出版日期2007-6-7
• 单位中国地震局