超导FeSe0.4Te0.6中嵌套波矢处的自旋能隙与共振
超导电性
2009-08-10 v1
摘要
利用中子散射技术探测了FeSe_{0.4}Te_{0.6} (T_c=14 K)中的磁激发。发现低能自旋涨落具有特征波矢，该波矢对应于费米面嵌套，且不同于Fe_{1+y}Te中磁有序的Q_m=(\delta,0,0.5)。在超导态中，从正常态连续谱发展出一个自旋共振，其\hbar\Omega_0=6.5 meV ≈ 5.3 k_BT_c，\hbar\Gamma=1.25 meV。我们证明该共振与s+/-超导性和不完全准二维费米面嵌套相关的束缚态一致。
引用
@article{arxiv.0905.3559,
title = {Spin Gap and Resonance at the Nesting Wavevector in Superconducting FeSe0.4Te0.6},
author = {Yiming Qiu and Wei Bao and Yang Zhao and Collin Broholm and V. Stanev and Z. Tesanovic and Y. C. Gasparovic and S. Chang and Jin Hu and Bin Qian and Minghu Fang and Zhiqiang Mao},
journal= {arXiv preprint arXiv:0905.3559},
year = {2009}
}
备注
4 pages, 4 figures, Submitted to Phys. Rev. Lett