论文标题
氢键在电荷订购的有机导体中的角色$α$ - （bedt-ttf）$ _ 2 $ i $ _3 $由$^{127} $ i核Quadrupole共振
Role of hydrogen bonding in charge-ordered organic conductor $α$-(BEDT-TTF)$_2$I$_3$ probed by $^{127}$I nuclear quadrupole resonance
论文作者
论文摘要
我们提出$^{127} $ i核四极共振光谱和$α$ - （bedt-ttf）$ _ 2 $ i $ _3 $的核放松，该$ _ 2 $ i $ _3 $经历了收费订购的过渡。两个I $ _3 $阴离子站点中只有一个在一阶过渡过程中显示出电场梯度的显着差异。仅在BEDT-TTF层中的电荷调制无法繁殖；取而代之的是，必须使用伴有氢键的阴离子唐相互作用。核松弛的主导源是I $ _3 $阴离子的局部库，但是在过渡下方检测到异常峰，如$^{13} $ C NMR所观察到的那样。
We present $^{127}$I nuclear quadrupole resonance spectra and nuclear relaxation of $α$-(BEDT-TTF)$_2$I$_3$ that undergoes a charge-ordering transition. Only one of the two I$_3$ anion sites shows a significant differentiation in the electric field gradients across the first-order transition. The charge modulation only in the BEDT-TTF layers can not reproduce; instead, an anion-donor interaction accompanied by hydrogen bonding is necessary. The dominating source for the nuclear relaxation is the local libration of the I$_3$ anions, but an anomalous peak is detected just below the transition, as observed by $^{13}$C NMR.
