BaFe2（As0.65 P 0.35）2（Tc = 30 K）的强自旋共振
Strong spin resonance on BaFe2(As0.65P0.35)2 with Tc = 30 K
摘要：
对Tc = 30 K的掺磷铁基超导体BaFe_2（As_（0.65）P_（0.35））_2粉末样品进行了中子非弹性散射研究，其超导序参量具有线节点。我们在SC态中观察到了Q $\sim$ 1.2 π ^{-1}和E=12 meV的自旋共振。共振增强，这可以是一个衡量的面积之间的空穴和电子费米面（FS）的符号反转，是可比的其他铁基超导体没有线节点。这一事实表明，符号反转之间的FS仍然是占主导地位的在这个系统中，和线节点应该创建一个单一的FS上的符号反转的只有有限的区域。因此，该系统可以保持相对较高的Tc。与理论计算结果的比较表明，水平线节点可能是再现观测的候选节点。
英文摘要：
We performed inelastic neutron scattering on powder sample of the P-doped iron-based superconductor BaFe2(As0.65P0.35)2 with Tc = 30K, whose superconducting (SC) order parameter is expected to have line nodes. We have observed spin resonance at Q $\sim$ 1.2Å^{-1} and E=12 meV in the SC state. The resonance enhancement, which can be a measure of the area of sign reversal between the hole and electron Fermi surfaces (FSs), is comparable to those of other iron-based superconductors without line nodes. This fact indicates that the sign reversal between the FSs is still dominant in this system, and the line nodes should create only limited area of sign-reversal on a single FS. Hence the system can hold relatively high-Tc. Comparison with theoretical calculation indicates horizontal line nodes may be a candidate to reproduce the observation.
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