Measurement of a Double Neutron-Spin Resonance and an Anisotropic Energy Gap for Underdoped Superconducting NaFe0.985Co0.015As Using Inelastic Neutron Scattering
Measurement of a Double Neutron-Spin Resonance and an Anisotropic Energy Gap for Underdoped Superconducting NaFe0.985Co0.015As Using Inelastic Neutron Scattering
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利用非弹性中子散射测量欠掺杂超导 NaFe0.985Co0.015As 双中子自旋共振和各向异性能隙
DOI：
10.1103/physrevlett.111.207002
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发表时间：
2013
影响因子：
8.6
通讯作者：
Dai Pengcheng
中科院分区：
文献类型：
--
作者：
Zhang Chenglin;Yu Rong;Su Yixi;Song Yu;Wang Miaoyin;Tan Guotai;Egami Takeshi;Fern;ez-Baca J. A.;Faulhaber Enrico;Si Qimiao;Dai Pengcheng
We use inelastic neutron scattering to show that superconductivity in electron-underdopedinduces a dispersive sharp resonance nearand a broad dispersionless mode at. However, similar measurements on overdoped superconductingfind only a single sharp resonance at. We connect these results with the observations of angle-resolved photoemission spectroscopy that the superconducting gaps in the electron Fermi pockets are anisotropic in the underdoped material but become isotropic in the overdoped case. Our analysis indicates that both the double neutron spin resonances and gap anisotropy originate from the orbital dependence of <?format ?>the superconducting pairing in the iron pnictides. Our discovery also shows the importance of the inelastic neutron scattering in detecting the multiorbital superconducting gap structures of iron pnictides.
