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首页> 外文期刊>Journal of the Physical Society of Japan >NMR Evidences of the Coupling between Conduction Electrons and Molecular Degrees of Freedom in the Exotic Member of the Bechgaard Salt (TMTSF)(2)FSO3
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NMR Evidences of the Coupling between Conduction Electrons and Molecular Degrees of Freedom in the Exotic Member of the Bechgaard Salt (TMTSF)(2)FSO3

机译：Bechgaard盐（TMTSF）（2）FSO3的外来成员中传导电子与分子自由度的耦合的NMR证据。

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We performed Se-77- and F-19-NMR measurements on single crystals of (TMTSF)(2)FSO3 to characterize the electronic structures of different phases in the temperature-pressure phase diagram, determined by precise transport measurements [Jo et al., Phys. Rev. B 67, 014516 (2003)]. We claim that such varieties of electronic states in the refined phase diagram are caused by strong couplings of the conduction electrons with FSO3 anions, especially with the permanent electric dipoles on the anions. We suggest that as temperature decreases, the FSO3 anions form orientational ordering through two steps; first, only the tetrahedrons form an orientational order leaving the orientations of the electronic dipoles in random (transition I); then the dipoles form a perfect orientational order at a lower temperature (transition II). In the intermediate temperature range between transitions I and II, we found an appreciable enhancement of homogeneous and inhomogeneous widths of the Se-77- NMR spectrum. From the analysis of the angular dependence of the linewidth, we attributed these anomalies to the intramolecular charge disproportionation or imbalance and its slow dynamics caused by the coupling with the permanent electric dipole of the anion. Results of F-19- NMR relaxation and lineshape measurements support this picture very well. Electronic structures at higher pressures up to 1.25 GPa are discussed on the basis of the results of the Se-77- and F-19-NMR measurements.
机译：我们对（TMTSF）（2）FSO3单晶进行了Se-77-和F-19-NMR测量，以表征温度-压力相图中不同相的电子结构，这是通过精确的传输测量确定的[Jo等人。 ，物理修订版B 67，014516（2003）]。我们声称，精制相图中的这种电子状态变化是由于传导电子与FSO3阴离子，特别是与阴离子上的永久电偶极子的强耦合而引起的。我们建议，随着温度降低，FSO3阴离子通过两个步骤形成取向有序。首先，只有四面体形成取向顺序，而电子偶极子的取向却是随机的（转变I）;那么偶极子在较低的温度下会形成理想的取向顺序（转变II）。在过渡I和II之间的中间温度范围内，我们发现Se-77-NMR光谱的均相和非均相宽度有了明显的提高。通过分析线宽的角度依赖性，我们将这些异常归因于分子内电荷歧化或不平衡及其与阴离子的永久性电偶极耦合引起的缓慢动力学。 F-19-NMR弛豫和线形测量结果很好地支持了这张图片。根据Se-77和F-19-NMR的测量结果，讨论了高达1.25 GPa的高压下的电子结构。

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