Publication Date:
2016-06-14
Description:
Author(s): Scott V. Carr, Chenglin Zhang, Yu Song, Guotai Tan, Yu Li, D. L. Abernathy, M. B. Stone, G. E. Granroth, T. G. Perring, and Pengcheng Dai Because of the unconventional nature of high-temperature superconductors, it has been proposed that magnons, rather than phonons, play an important role in Cooper pair formation. It is therefore of great importance to understand how magnetic excitations behave and evolve between superconducting and nonsuperconducting compounds. In this work, the authors present a comprehensive study of the magnetic excitations in electron-doped NaFe 1 − x Co x As in several samples across the phase diagram, including both superconducting and nonsuperconducting compounds. They find a strong suppression of low-energy magnetic scattering connected with the onset of superconductivity but no effect on either high-energy scattering intensity or bandwidth. Additionally, through comparison with the related but structurally distinct compound BaFe 2 − x Ni x As 2 , they find a comparable total moment despite a smaller ordered moment, narrower scattering bandwidth, and T c . These features all point to magnetism as an agent in the formation of superconductivity. [Phys. Rev. B 93, 214506] Published Mon Jun 13, 2016
Keywords:
Superfluidity and superconductivity
Print ISSN:
1098-0121
Electronic ISSN:
1095-3795
Topics:
Physics
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