Coexistence of Charge-Order and Superconductivity in Organic Conductors

有机导体中电荷序与超导性的共存

• 批准号: 197063068
• 负责人: Professor Dr. Martin Dressel
• 金额: --
• 依托单位: 1. Physikalisches Institut
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/197063068?language=en
• 关键词: Coexistence; Charge; Order; Superconductivity; Organic

Charge order is an insulating ground state due to electronic correlations with basically no charge transport; on the other hand, theory has predicted and experiment has confirmed that charge-order fluctuations can be closely linked to superconductivity. This might be seen in analogy to superconductivity mediated by spin fluctuations.When the charge-ordered state is next to superconductivity in the phase diagram (as a function of doping or pressure), it is not clear whether both ground states exclude each other or whether there is a range of coexistence. In the present project we want to investigate two-dimensional organic conductors by vibrational spectroscopy combined with in-situ resistivity measurements, in order to elucidate if in the phase diagram there is a range of coexistence of superconductivity and charge order. Spatially resolved spectroscopic investigations shall give information on possible electronic phase separation, inhomogeneities, and domains.

由于电子相关性，电荷顺序是绝缘基态，基本上没有电荷传输；另一方面，理论预测和实验证实，电荷序涨落与超导性密切相关。这可以类比于自旋涨落介导的超导性。当相图中电荷有序态紧邻超导性时（作为掺杂或压力的函数），不清楚两个基态是否相互排斥或是否相互排斥。有一定范围的共存。在本项目中，我们希望通过振动光谱结合原位电阻率测量来研究二维有机导体，以阐明相图中是否存在一定范围的超导性和电荷序共存。空间分辨光谱研究应提供有关可能的电子相分离、不均匀性和域的信息。

项目成果

Piston pressure cell for low-temperature infrared investigations.

用于低温红外研究的活塞压力传感器

• DOI: 10.1063/1.4920921
• 发表时间: 2015
• 期刊: The Review of scientific instruments
• 作者: R. Beyer;M. Dressel
• 通讯作者: M. Dressel

Metallic state and charge-order metal-insulator transition in the quasi-two-dimensional conductor κ-(BEDT-TTF)2Hg(SCN)2Cl

• DOI: 10.1103/physrevb.89.075133
• 发表时间: 2014-02-26
• 期刊: PHYSICAL REVIEW B
• 影响因子: 3.7
• 作者: Drichko, Natalia;Beyer, Rebecca;Lyubovskaya, R. N.
• 通讯作者: Lyubovskaya, R. N.

Charge-order fluctuations and superconductivity in two-dimensional organic metals

• DOI: 10.1103/physrevb.89.174503
• 发表时间: 2014-05-08
• 期刊: PHYSICAL REVIEW B
• 影响因子: 3.7
• 作者: Girlando, Alberto;Masino, Matteo;Dressel, Martin
• 通讯作者: Dressel, Martin

Ferroelectricity in molecular solids: a review of electrodynamic properties

• DOI: 10.1088/0034-4885/78/9/096501
• 发表时间: 2015-07
• 期刊: Reports on Progress in Physics
• 影响因子: 18.1
• 作者: Silvia Tomić;M. Dressel