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关于自旋电子的一些为什么*——浅谈与超导电性对抗的磁性元素Fe,Co,Ni为什么形成化合物就超导了?

Some whys of spintronics——why can the elements Fe, Co, and Ni,formerly considered incompatible with superconductivity, become superconducting when in compounds?

  • 摘要: 在近20年来的凝聚态物理研究中,人们在铜基氧化物中发现了高温超导电性,在锰基钙钛矿中发现了巨磁电阻效应,以及近年来发现由铁、钴、镍等传统认为与超导对抗的元素组成化合物后可以形成超导.这些不同的体系有着迥然不同的物理行为,却具有一个共同的特征:这些铜、锰、铁、钴、镍基化合物都是3d电子材料.那么,同为3d电子,为什么在不同的环境中表现出完全不同甚至对抗的行为?文章对这些现象提出了一系列为什么,并对其进行了探讨.

     

    Abstract: During the past two decades, high-Tc superconductivity has been discovered in cuprates, and colossal magnetoresistance in perovskite manganites; now, Fe, Co and Ni, which used to be considered incompatible with superconductivity, have been found to be superconducting when forming compounds. These systems have completely different physical behaviors, but also have one common characteristic: all the compounds are 3d-electron materials. So, why is it that the same 3d electrons exhibit completely different or even opposite behaviors in different environments? In this paper, the author presents and explores a series of whys of these remarkable phenomena.

     

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