论文标题
直接观察铁基超导体Andreev光谱中的自旋激子
Direct observation of the spin exciton in Andreev spectroscopy of iron-based superconductors
论文作者
论文摘要
准粒子激发提供了有关非常规超导体物理学的可行信息。希格斯和leggett模式是一些经典的例子。另一个重要的骨气激发是自旋激子起源于改变标志的超导间隙结构。在这里，我们报告了对铁基超导体Andreev光谱中温度依赖性自旋激子的直接观察。结合其他实验证据，我们的观察结果证实了扩展的$ s $ - 波（$ s_ \ pm $）订单参数对称性，并间接证明了库珀配对的自旋 - 拖放机制。
Quasiparticle excitations provide viable information on the physics of unconventional superconductors. Higgs and Leggett modes are some of the classic examples. Another important bosonic excitation is the spin exciton originating from the sign-changing superconducting gap structure. Here we report a direct observation of the temperature-dependent spin exciton in the Andreev spectra of iron-based superconductors. Combined with the other experimental evidence, our observation confirms the extended $s$-wave ($s_\pm$) order parameter symmetry and indirectly proves the spin-fluctuation mechanism of Cooper pairing.
