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.

在这个项目中，自旋梯和自旋链系统M14 Cu 24 O 41（M=La、Y、Sr或Ca）的电荷动力学将通过在宽频率范围内（从远红外到紫外）的反射率测量作为温度和外部压力的函数进行研究。所研究的材料将包括化合物Sr 14-xCaxCu 24 O 41，其在高Ca含量的高压下变得超导。具体的问题，这将得到解决，是作为钙含量x，温度和压力，电子-声子耦合的重要性和系统的维数的函数的阶梯和链子系统之间的孔的分布。对于欠掺杂材料La_3Sr_3Ca_8 Cu_（24）O_（41）和Y_3Sr_（11）Cu_（24）O_（41），我们将首次探讨在压力作用下电荷密度波态（绝缘空穴维格纳晶体态）的稳定性。