Infrared, Elastic and Thermal Anomalies in Low-Dimensional Conductors

低维导体中的红外、弹性和热异常

• 批准号: 8915440
• 负责人: Joseph Brill
• 金额: $ 20万
• 依托单位: University of Kentucky Research Foundation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-03-01 至 1993-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8915440&HistoricalAwards=false
• 关键词: Infrared; Elastic; Thermal; Anomalies; Low

Infrared, specific heat, and elastic measurements on low- dimensional conductors are to be carried out. The goal of the IR experiments is to understand the role of solitons in charge- density-wave compounds with third- and quarter-filled bands. Strain and photo-modulation spectroscopy will be carried out on blue bronze, TaS3, and tetra-methyl-iodide-TCNQ. Elastic measurements will be implemented in the range 10 Hz to 10 MHz, in order to trace dependencies of elastic anomalies on frequency, temperature, and electric field, as well as effects of "switching", magnetic fields, and strain. The same apparatus can be used to study flux depinning in 2D superconductors. An ac calorimeter will be constructed to examine specific heat anomalies at phase transitions, and the use of CDW semiconductors as thermometers will be studied.

对低维导体进行红外、比热和弹性测量。 红外实验的目标是了解孤子在具有第三和四分之一填充带的电荷密度波化合物中的作用。 应变和光调制光谱将在蓝青铜、TaS3 和四甲基碘-TCNQ 上进行。 弹性测量将在 10 Hz 至 10 MHz 范围内进行，以便追踪弹性异常对频率、温度和电场的依赖性，以及“切换”、磁场和应变的影响。 相同的设备可用于研究二维超导体中的通量脱钉。 将建造交流热量计来检查相变时的比热异常，并将研究 CDW 半导体作为温度计的用途。