Transient Photo-induced Conductivity in High Tc Materials: Phase Separation in Photogenerated Carriers into Metallic Drops and Photo-Induced Superconductivity

高 Tc 材料中的瞬态光致电导率：光生载流子中的相分离成金属滴和光致超导

• 批准号: 9121946
• 负责人: Alan Heeger
• 金额: --
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-07-01 至 1995-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9121946&HistoricalAwards=false
• 关键词: Transient; Photo; induced; Conductivity; Tc

Preliminary measurements of the conductivity in high Tc 1-2-3 type copper oxide crystals after a short pulse of intense visible radiation show the lifetime of the photo-excited state is enhanced by nearly three orders of magnitude. The goal is to test two hypotheses: (1) the excitation process causes phase separation of the photo-induced carriers into metallic regions or droplets and (2) a photo-induced high temperature superconducting state is present in these phase separated metallic regions. Steady state and fast transient spectroscopy will be undertaken on several high Tc materials using strip-line configurations as a function of temperature and magnetic field.

对高Tc 1-2-3型氧化铜晶体在强可见光短脉冲辐照后的电导率的初步测量表明，光激发态的寿命提高了近三个数量级。目标是测试两个假设：（1）激发过程导致光致载流子相分离成金属区域或液滴，以及（2）光致高温超导状态存在于这些相分离的金属区域中。稳态和快速瞬态光谱将进行几个高Tc材料使用带状线配置作为温度和磁场的函数。