Tuning the ground state of strongly interacting low-dimensional electron systems by pressure: the cuprate spin ladder compounds

通过压力调节强相互作用低维电子系统的基态：铜酸盐自旋梯化合物

• 批准号: 111412854
• 负责人: Professorin Dr. Christine Kuntscher
• 金额: --
• 依托单位: Lehrstuhl für Experimentalphysik II
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/111412854?language=en
• 关键词: Tuning; ground; state; strongly; interacting

Within this project the charge dynamics of the spin ladder and spin chain system M14Cu24O41 with M=La,Y,Sr or Ca will be studied as a function of temperature and external pressure by reflectivity measurements over a broad frequency range, from the far-infrared up to the ultraviolet. The studied materials will include the compounds Sr14-xCaxCu24O41, which become superconducting under high pressure for high Ca contents. Specific questions, which will be addressed, are the distribution of holes among the ladder and chain subsystems as a function of Ca content x, temperature and pressure, the importance of electron-phonon coupling and the dimensionality of the system. For the underdoped materials La3Sr3Ca8Cu24O41 and Y3Sr11Cu24O41 we will explore the stability of the charge-density-wave state (insulating hole Wigner crystal state) regarding the application of pressure for the first time.

在该项目中，将通过从远红外到宽频率范围的反射率测量，研究 M=La、Y、Sr 或 Ca 的自旋梯和自旋链系统 M14Cu24O41 的电荷动力学作为温度和外部压力的函数。直至紫外线。研究的材料将包括化合物Sr14-xCaxCu24O41，它们在高Ca含量的高压下变得超导。将要解决的具体问题是梯子和链子系统中空穴的分布，作为 Ca 含量 x、温度和压力、电子声子耦合的重要性以及系统维数的函数。对于欠掺杂材料La3Sr3Ca8Cu24O41和Y3Sr11Cu24O41，我们将首次探讨施加压力时电荷密度波态（绝缘孔维格纳晶态）的稳定性。