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相关概念视频

Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.

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High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions
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超快的YBa(2)Cu(3)O(7-delta) 的中红外响应非常快.

Kaindl1, Woerner, Elsaesser

  • 1Max-Born-Institut fur Nichtlineare Optik und Kurzzeitspektroskopie, D-12489 Berlin, Germany. Department of Physics, Clarendon Laboratory, Oxford University, Oxford OX1 3PU, UK. Department of Pure and Applied Physics, Queen's University of Belfast.

Science (New York, N.Y.)
|January 22, 2000
PubMed
概括

研究人员观察到,在高过渡温度超导体中,超快的空隙填充. 这揭示了两个组成部分,一个与超导性相关,另一个与伪间隙相关,表明与旋转激发的联系.

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科学领域:

  • 凝聚物质物理学 凝聚物质物理学
  • 材料科学是一种材料科学.
  • 超导电性 超导电性 超导电性

背景情况:

  • 高过渡温度超导体表现出一个中红外在平面导电性差距.
  • 这种导电性差距在超导性中的确切作用尚未完全理解.

研究的目的:

  • 为了研究光学刺激后YBa(2)Cu(3)O(7-delta) 中的中红外导电性差距的动态.
  • 阐明不同电子元件对间隙恢复的贡献及其与超导和伪间隙现象的关系.

主要方法:

  • 用5秒时间分辨率光谱法测量中红外反射率.
  • 使用非平衡光学刺激来诱导超导状态的变化.

主要成果:

  • 观察到导电差距的超快速填充.
  • 确定了两个不同的回收组件:与超导冷凝相关的皮秒组件和与低兴奋剂样本中伪间隙相关的亚皮秒组件.
  • 这些组件的温度依赖幅度与通过中子散射观察到的反铁磁激发相关.

结论:

  • 这项研究证明了YBa(2)Cu(3)O(7-delta) 中导电性差距的超快动态.
  • 证据表明,在这些材料中,电荷动力学,超导电凝,伪间隙相关性和旋转激发之间存在联系.