75As NMR studies of superconducting LaFeAsO0.9F0.1
75As NMR studies of superconducting LaFeAsO0.9F0.1
复制标题
DOI：
10.1103/physrevlett.101.047003
复制
发表时间：
2008-07-25
影响因子：
8.6
通讯作者：
Buechner, B.
中科院分区：
文献类型：
--
作者：
Grafe, H. -J.;Paar, D.;Buechner, B.
我们对新的LaFeAsO（0.9）F（0.1）超导体的定向粉末进行了（75）As核磁共振测量。在正常状态下，我们发现自旋位移和自旋晶格弛豫速率的Korringa行为具有很强的温度依赖性。在超导态下，我们发现了超导能隙中的线节点和自旋单重态配对的证据。我们的测量揭示了自旋晶格弛豫速率的强各向异性，这表明超导涡旋有助于弛豫速率时，场是平行于c轴，但不是垂直方向。
We have performed (75)As nuclear magnetic resonance measurements on aligned powders of the new LaFeAsO(0.9)F(0.1) superconductor. In the normal state, we find a strong temperature dependence of the spin shift and Korringa behavior of the spin lattice relaxation rate. In the superconducting state, we find evidence for line nodes in the superconducting gap and spin-singlet pairing. Our measurements reveal a strong anisotropy of the spin lattice relaxation rate, which suggests that superconducting vortices contribute to the relaxation rate when the field is parallel to the c axis but not for the perpendicular direction.