Involvement of structural dynamics in charge-glass formation in strongly frustrated molecular metals
Involvement of structural dynamics in charge-glass formation in strongly frustrated molecular metals
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结构动力学参与强受挫分子金属中电荷玻璃的形成
DOI：
10.1103/physrevb.105.l041114
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发表时间：
2022
影响因子：
3.7
通讯作者：
M?ller Jens
中科院分区：
文献类型：
--
作者：
Thomas Tatjana;Saito Yohei;Agarmani Yassine;Thyzel Tim;Lonsky Martin;Hashimoto Kenichiro;Sasaki Takahiko;Lang Michael;M?ller Jens
我们提出了一个结合热膨胀和电阻波动光谱测量的研究，探索电荷玻璃形成的静态和动态方面的准二维有机导体与= Cs和= Co，Zn。在这些材料中，一种新的电荷玻璃态的出现到目前为止已经被解释在纯粹的电子术语，通过考虑三角形晶格上的库仑相互作用的强烈挫折。与此观点相反，我们提供了全面的证据，参与astructuralglasslike过渡。这种玻璃化转变可以被分配到冻结的乙烯端基在供体分子的结构构象的活化能，和伴随的电荷载流子动力学的减慢是很好地描述了由一个模型的非指数动力学。这些发现揭示了相图的一个重要方面，并呼吁重新审视整个家族的玻璃态动力学的现有观点。我们的研究结果表明，由于晶格和电子自由度的紧密耦合，缓慢的结构和电荷团簇动力学的纠缠决定几何挫折下的电荷玻璃的形成。
We present a combined study of thermal expansion and resistance fluctuation spectroscopy measurements exploring the static and dynamic aspects of the charge-glass formation in the quasi-two-dimensional organic conductorswith= Cs and= Co,Zn. In these materials, the emergence of a novel charge-glass state so far has been interpreted in purely electronic terms by considering the strong frustration of the Coulomb interactions on a triangular lattice. Contrary to this view, we provide comprehensive evidence for the involvement of astructuralglasslike transition at. This glassy transition can be assigned to the freezing of structural conformations of the ethylene endgroups in the donor molecule with an activation energy of, and the concomitant slowing down of the charge-carrier dynamics is well described by a model of nonexponential kinetics. These findings disclose an important aspect of the phase diagram and calls for revisiting the present views of the glassy dynamics in the whole family of. Our results suggest that the entanglement of slow structural and charge-cluster dynamics due to the intimate coupling of lattice and electronic degrees of freedom determine the charge-glass formation under geometric frustration.