Photogenerated Polarons in High-Tc Superconducting Oxides: Infrared Excitation Spectroscopy and Transient Photoinduced Conductivity in Semiconducting Yttrium-Barium-Copper-Oxides

高温超导氧化物中的光生极化子：半导体钇钡铜氧化物中的红外激发光谱和瞬态光致电导率

• 批准号: 9102634
• 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: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-02-15 至 1992-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9102634&HistoricalAwards=false
• 关键词: Photogenerated; Polarons; Tc; Superconducting; Oxides

Funds are requested for a Small Grants for Exploratory Research award to study the fast transient photoinduced conductivity and photoinduced absorption of materials from the family of high temperature superconducting oxides. Photoinduced absorption studies in this researcher's laboratory have already demonstrated carriers on the copper oxide planes are polarons and large transient decreases in the resistivity of single crystals of yttrium-barium cuprate have been observed. The proposed research will search for experimental evidence of the relevence of the polarons to the mechanism of superconductivity. The level of excitation will be sufficiently high to approach a photoinduced metallic state and photoinduced superconductivity.

申请的资金用于探索性研究小额赠款，以研究高温超导氧化物系列材料的快速瞬态光致电导率和光致吸收。该研究人员实验室的光致吸收研究已经证明氧化铜平面上的载流子是极化子，并且已经观察到铜酸钇钡单晶的电阻率的大的瞬态降低。该研究将寻找极化子对超导电性机制影响的实验证据。激发水平将足够高以接近光诱导金属态和光诱导超导性。