Voloshenko Ievgen, Herter Melina, Beyer Rebeca, Pustogow Andrej, Dressel Martin
Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany.
J Phys Condens Matter. 2017 Mar 22;29(11):115601. doi: 10.1088/1361-648X/aa579c. Epub 2017 Feb 7.
In a comprehensive infrared study, the molecular vibrational features of (TMTTF)SbF, (TMTTF)AsF and (TMTTF)PF single crystals have been measured down to temperatures as low as 7 K by applying hydrostatic pressure up to 11 kbar. We follow the charge disproportionation below the critical temperatures T as pressure increases, and determine the critical pressure values p at which the charge-ordered phase is suppressed. The coexistence of the spin-Peierls phase with charge order is explored at low temperatures, and the competition of these two phases is observed. Based on our measurements we construct a generic phase diagram of the Fabre salts with centrosymmetric anions. The pressure-dependent anion and methyl-group dynamics in these quasi-one-dimensional charge transfer compounds yields information about the interplay of the organic molecules in the stacks and the anions, and how this interaction varies upon the transition to the charge-ordered state.
在一项全面的红外研究中，通过施加高达11千巴的静水压力，测量了(TMTTF)SbF、(TMTTF)AsF和(TMTTF)PF单晶在低至7 K温度下的分子振动特征。随着压力增加，我们追踪低于临界温度T时的电荷 disproportionation，并确定电荷有序相被抑制时的临界压力值p。在低温下探索了自旋 - 佩尔斯相与电荷有序的共存情况，并观察到这两个相的竞争。基于我们的测量结果，我们构建了具有中心对称阴离子的法布勒盐的通用相图。这些准一维电荷转移化合物中压力依赖的阴离子和甲基动力学提供了关于堆叠中有机分子与阴离子之间相互作用的信息，以及这种相互作用在向电荷有序状态转变时如何变化。
