Electron doping evolution of the neutron spin resonance in NaFe1-xCoxAs

Zhang, Chenglin; Song, Yu; Carr, Scott Victor; Chi, Songxue; Christianson, Andrew D.; Matsuda, Masaaki; Fernandez-Baca, Jaime A.; Dai, Pengcheng; Lv, Weicheng; Tan, Guotai; Harriger, L. W.

doi:10.1103/PhysRevB.93.174522

Title: Electron doping evolution of the neutron spin resonance in NaFe_1-xCo_xAs

Journal Article · Tue May 31 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.93.174522· OSTI ID:1287031

Zhang, Chenglin ^[1]; Song, Yu ^[1]; Carr, Scott Victor ^[1]; Chi, Songxue ^[2]; Christianson, Andrew D. ^[2]; Matsuda, Masaaki ^[2]; Fernandez-Baca, Jaime A. ^[3]; Dai, Pengcheng ^[4]; Lv, Weicheng ^[1]; Tan, Guotai ^[5]; Harriger, L. W. ^[6]

Rice Univ., Houston, TX (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Rice Univ., Houston, TX (United States); Beijing Normal Univ., Beijing (China)
Normal Univ., Beijing (China)
National Institute of Standards and Technology, Gaithersburg, MD (United States)

Neutron spin resonance, a collective magnetic excitation coupled to superconductivity, is one of the most prominent features shared by a broad family of unconventional superconductors including copper oxides, iron pnictides, and heavy fermions. In this paper, we study the doping evolution of the resonances in NaFe_1–xCo_xAs covering the entire superconducting dome. For the underdoped compositions, two resonance modes coexist. As doping increases, the low-energy resonance gradually loses its spectral weight to the high-energy one but remains at the same energy. By contrast, in the overdoped regime we only find one single resonance, which acquires a broader width in both energy and momentum but retains approximately the same peak position even when T_c drops by nearly a half compared to optimal doping. Furthermore, these results suggest that the energy of the resonance in electron overdoped NaFe_1–xCo_xAs is neither simply proportional to T_c nor the superconducting gap but is controlled by the multiorbital character of the system and doped impurity scattering effect.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; SC0012311

OSTI ID:: 1287031

Alternate ID(s):: OSTI ID: 1254894

Journal Information:: Physical Review B, Vol. 93, Issue 17; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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Local orthorhombic lattice distortions in the paramagnetic tetragonal phase of superconducting NaFe1−xNixAs Wang, Weiyi; Song, Yu; Cao, Chongde Nature Communications, Vol. 9, Issue 1 https://doi.org/10.1038/s41467-018-05529-2	journal	August 2018
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Title: Electron doping evolution of the neutron spin resonance in NaFe_1-xCo_xAs