Spin density wave in oxypnictide superconductors in a three-band model
Spin density wave in oxypnictide superconductors in a three-band model
复制标题
三能带模型中氧磷元素超导体中的自旋密度波
DOI:
10.1140/epjb/e2010-00141-3
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发表时间:
2010-04
期刊:
影响因子:
--
通讯作者:
M. S. Long
中科院分区:
文献类型:
--
作者:
W. LiMing;L. B. Hu;M. S. Long
The spin density wave and its temperature dependence in oxypnictide are studied in a three-band model. The spin susceptibilities with various interactions are calculated in the random phase approximation (PPA). It is found that the spin susceptibility peaks around the M point show a spin density wave (SDW) with momentum (0, π) and a clear stripe-like spin configuration. The intra-band Coulomb repulsion enhances remarkably the SDW but the Hund’s coupling weakens it. It is shown that a new resonance appears at higher temperatures at the Γ point indicating the formation of a paramagnetic phase. There is a clear transition from the SDW phase to the paramagnetic phase.
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