关于自旋电子的一些为什么浅谈与超导电性对省略FeCoNi为什么形成化合.pdf

* ) ) ) 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? 张裕恒1, 2,­ ( 1 230026) (2 230026) 20 , , , . ,: 3d . , 3d ,? , . ,, ,- - , Some whys of spintronics ) ) ) why can the elements Fe, Co, and Ni, formerly considered incompatible with superconductivity, become superconducting when in compounds? Z ANG Yu- eng1, 2,­ ( 1 School of Phy sical Sciences, University of Science and Technology of China, H ef ei 230026, China) (2 H ig h Mag netic Field L abor atory , Chinese A cademy of Sciences, H ef ei 230026, China) Abstract During the past two decades, high-T superconductivity has been discovered in cuprates, and c colossal magnetoresistance in perovskite manganites; now, Fe, Co and Ni, which used to be considered in- compatible with superconductivity, have been foundto be superconductingwhen forming compounds. T hese systems have completely different physical behaviors, but also have one common characteristic: allthe com- pounds are 3d-electron materials. So, why is it that the same 3d electrons exhibit completely different or e- ven opposite behaviors in different environments? In this paper, the author presents and explores a series of whys of these remarkable phenomena. Keywords spintronics, superconductivity, orbital overlap, charge-orbital-spin ordering, interaction 7 n. l. m. ,,? 1 自旋电子的一些为什么 (2) ? d 7n2m (m= 2, 1,0, - 1,- 2) 7n00? ( 1) ) ) ) (3) 3d ,Cu ( a) s ? ? * ( : 2010CB923403) ( b) d ?