Journal
PHYSICAL REVIEW LETTERS
Volume 111, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.207002
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Funding
- U.S. DOE, BES [DE-FG02-05ER46202]
- NSF [DMR-1309531]
- Robert A. Welch Foundation [C-1411]
- U.S. DOE BES through the EPSCoR [DE-FG02-08ER46528]
- Division of Scientific User Facilities, U.S. DOE, BES
- NSFC [11374361]
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We use inelastic neutron scattering to show that superconductivity in electron-underdoped NaFe0.985Co0.015As induces a dispersive sharp resonance near E-r1 = 3.25 meV and a broad dispersionless mode at E-r2 = 6 meV. However, similar measurements on overdoped superconducting NaFe0.935Co0.045As find only a single sharp resonance at E-r = 7 meV. 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 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.
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