Multiband magnetism and superconductivity in Fe-based compounds
Multiband magnetism and superconductivity in Fe-based compounds
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DOI：
10.1209/0295-5075/85/37002
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发表时间：
2008-04
期刊：
影响因子：
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通讯作者：
Vladimir Cvetkovic;Z. Tes̆anović
中科院分区：
文献类型：
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作者：
Vladimir Cvetkovic;Z. Tes̆anović
最近发现的铁基层状化合物的超导电性可能为室温超导开辟了一条新的途径。引入了描述FeAs层的模型哈密顿量，强调了As原子的褶皱在促进d电子巡游和防止Fe离子的大的局域磁矩方面的关键作用，Fe离子是超导的主要敌人。研究了电荷通道、自旋通道和多带通道中的量子多粒子效应，发现在母体中存在嵌套诱导的自旋密度-波序。我们认为，这种主要的巡回反铁磁性和高T_c本身本质上与费米表面的多能带性质有关。
Recent discovery of superconductivity in Fe-based layered compounds may have opened a new pathway to the room temperature superconductivity. A model Hamiltonian describing FeAs layers is introduced, highlighting the crucial role of puckering of As atoms in promoting d electron itinerancy and warding off large local-moment magnetism of Fe ions, the main enemy of superconductivity. Quantum many-particle effects in charge, spin and multiband channels are explored and a nesting-induced spin density-wave order is found in the parent compund. We argue that this largely itinerant antiferromagnetism and high Tc itself are essentially tied to the multiband nature of the Fermi surface.