Ising-nematic spin correlations in the tetragonal state of uniaxial strained BaFe2-xNixAs2

摘要：

　　A determination of the microscopic origins of electronic phases in high-transition temperature (high-Tc) superconductors is important for understanding the mechanism of superconductivity.In the paramagnetic tetragonal phase, an in-plane resistivity anisotropy has been observed in the BaFe2-xTxAs2 (T=Co, Ni) iron pnictides.Here we use inelastic neutron scattering to show that low-energy spin excitations in these materials change from four-fold symmetry to two-fold symmetry at temperatures corresponding to the onset of the in-plane resistivity anisotropy.Since both the resistivity and spin excitation anisotropy vanishes near optimal superconductivity, we conclude that the spin Ising-nematic phase leads to the resistivity anisotropy and is also important for high-Tc superconductivity.

关键词： Ising-nematicity Spin correlations high-Tc superconductivity

作者: Xingye Lu J.T.Park Rui Zhang Huiqian Luo A.H.Nevidomskyy Qimiao Si Pengcheng Dai

作者单位: Beijing National Laboratory for Condensed Matter Physics,Institute of Physics, Chinese Academy of Sc Heinz Maier-Leibnitz Zentrum (MLZ), TU München, D-85748 Garching, Germany Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA;Beijing National Lab

会议类型: 国际会议

会议名称: 第十二届全国博士生学术年会——物理学专题

会议地点: 昆明

会议语种:英文

页码: 106-117

在线出版日期: 2014-05-01（万方平台首次上网日期，不代表论文的发表时间）