Optical studies of manganites, superconductors and laser materials - études optiques des manganite, supraconducteurs et matériaux laser

锰酸盐、超导体和激光材料的光学研究 - études optiques des manganite, superconducteurs et matériaux Laser

• 批准号: 350-2007
• 负责人: Jandl, Serge
• 金额: $ 2.33万
• 依托单位: Université de Sherbrooke
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2008
• 资助国家: 加拿大
• 起止时间: 2008-01-01 至 2009-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=388253
• 关键词: Optical; studies; manganites; superconductors; laser

Optical techniques such as inelastic light scattering, photoluminescence and infrared interferometry are very useful to develop fundamental science and to explain microscopic interactions in solids. We use these techniques to better understand the mechanisms and microscopic properties of: a)-recently discovered colossal magnetoresitance in manganites R(1-x)A(x)MnO3 (R = rare earth and A=Ba, Sr, Ca) where an unusually large change of resistivity is observed following the application of magnetic field. Such materials are on one hand interesting from a fundamental viewpoint since charge, spin and lattice ions are strongly coupled giving rise to numerous physical phenomena and phase transitions of current interest in condensed matter. On the other hand, they offer potential in magnetic recording media sensors and spin polarized electronics. b)-high critical temperature superconductors, e.g. R(2-x)Ce(x)CuO4, characterized by absence of resistance and perfect diamagnetism prevalence below Tc. They are important materials typically for current transport without losses, for high magnetic field generation and for devices that detect very weak magnetic fields. c)-rare earth based optical devices such as solid state lasers and optical memories obtained by doping oxides with rare earth ions (e.g. Nd: YVO4 and Yb:Y2SiO5).

非弹性光散射、光致发光和红外干涉等光学技术对于发展基础科学和解释固体中的微观相互作用是非常有用的。我们使用这些技术来更好地理解的机制和微观性质：a）-最近发现的锰氧化物R（1-x）A（x）MnO 3（R =稀土和A=Ba，Sr，Ca）的巨磁阻，其中观察到一个异常大的电阻率变化后，磁场的应用。这样的材料一方面从基本观点来看是有趣的，因为电荷、自旋和晶格离子强烈耦合，从而引起凝聚态物质中当前感兴趣的许多物理现象和相变。另一方面，它们在磁记录介质传感器和自旋极化电子学中提供了潜力。B）-高临界温度超导体，例如R（2-x）Ce（x）CuO 4，其特征在于在低于Tc时没有电阻和完全抗磁性。它们是重要的材料，通常用于无损耗的电流传输，用于高磁场产生和用于检测非常弱的磁场的设备。c）-基于稀土的光学器件，例如通过用稀土离子掺杂氧化物（例如Nd：YVO 4和Yb：Y2 SiO 5）获得的固态激光器和光学存储器。