Magnetic fluctuations and nematic order in iron-based superconductors: Stability, short-time dynamics, transport and orbital correlations

铁基超导体中的磁涨落和向列序：稳定性、短时动力学、输运和轨道相关性

• 批准号: 237703666
• 负责人: Professor Dr. Ilya Eremin
• 金额: --
• 依托单位: Institut für Theorie der Kondensierten Materie (TKM)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/237703666?language=en
• 关键词: Magnetic; fluctuations; nematic; order; iron

Our overall goal is to better understand the role of electronic correlations in the iron-based superconductors. It is established that effective one-particle theories are successful in predicting the main features of the band structure of the Fe-pnictides. Nevertheless, it becomes increasingly evident that the many-body effects are strong in these systems. Perhaps, the most prominent example of it is an observation of electronically driven nematicity in the parent compounds of ferro-pnictides supported by various experimental probes. In this proposal we aim at developing a microscopic description of nematic order and the associated strong magnetoelastic coupling. In addition we will develop the theoretical framework for a number of important experiments that are being used to probe nematicity: elastic properties, NMR spin lattice relaxation rate, the resistivity, Hall effect and thermopower anisotropy, and ultrafast optics experiments.

我们的总体目标是更好地理解电子相关在铁基超导体中的作用。证明了有效的单粒子理论能够成功地预测铁粒子带结构的主要特征。然而，越来越明显的是，这些系统中的多体效应很强。也许，最突出的例子是观察到电子驱动的向列性在各种实验探针支持的铁- nictides的母体化合物。在这个建议中，我们的目标是发展向列序和相关的强磁弹性耦合的微观描述。此外，我们将开发用于探测向列性的许多重要实验的理论框架：弹性性质，核磁共振自旋晶格弛豫率，电阻率，霍尔效应和热功率各向异性，以及超快光学实验。

项目成果

Pair breaking in multiorbital superconductors: An application to oxide interfaces

多轨道超导体中的电子对断裂：在氧化物界面上的应用

• DOI: 10.1103/physrevb.92.014518
• 发表时间: 2015
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: M. S. Scheurer;M. Hoyer;J. Schmalian
• 通讯作者: J. Schmalian

Nematic Resonance in the Raman Response of Iron-Based Superconductors.

• DOI: 10.1103/physrevlett.116.017001
• 发表时间: 2015-04
• 期刊: Physical review letters
• 影响因子: 8.6
• 作者: Y. Gallais;I. Paul;L. Chauvière;J. Schmalian

Manifestation of nematic degrees of freedom in the Raman response function of iron pnictides

铁磷族化合物拉曼响应函数中向列自由度的表现

• DOI: 10.1103/physrevb.92.075134
• 发表时间: 2015
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: U. Karahasanović;F. Kretzschmar;T. Böhm;R. Hackl;I. Paul;Y. Gallais;J. Schmalian
• 通讯作者: J. Schmalian

Disorder-promoted C 4 -symmetric magnetic order in iron-based superconductors

• DOI: 10.1103/physrevb.93.144414
• 发表时间: 2015-12
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: M. Hoyer;R. Fernandes;A. Levchenko;J. Schmalian

Ultrafast observation of critical nematic fluctuations and giant magnetoelastic coupling in iron pnictides

• DOI: 10.1038/ncomms4229
• 发表时间: 2014-02-01
• 期刊: NATURE COMMUNICATIONS
• 影响因子: 16.6
• 作者: Patz, Aaron;Li, Tianqi;Wang, Jigang
• 通讯作者: Wang, Jigang