Temperature and polarization dependence of low-energy magnetic fluctuations in nearly optimally doped NaFe0.9785Co0.0215As

Song, Yu; Wang, Weiyi; Zhang, Chenglin; Gu, Yanhong; Lu, Xingye; Tan, Guotai; Su, Yixi; Bourdarot, Frédéric; Christianson, Andrew D.; Li, Shiliang; Dai, Pengcheng

doi:10.1103/PhysRevB.96.184512

Title: Temperature and polarization dependence of low-energy magnetic fluctuations in nearly optimally doped ${NaFe}_{0.9785} {Co}_{0.0215} As$

Journal Article · Tue Nov 14 00:00:00 EST 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.96.184512· OSTI ID:1409258

Song, Yu ^[1]; Wang, Weiyi ^[1]; Zhang, Chenglin ^[1]; Gu, Yanhong ^[2]; Lu, Xingye ^[3]; Tan, Guotai ^[3]; Su, Yixi ^[4]; Bourdarot, Frédéric ^[5];

^[6]; Li, Shiliang ^[7]; Dai, Pengcheng ^[8]

Rice Univ., Houston, TX (United States)
Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China)
Beijing Normal Univ., Beijing (China)
Forschungszentrum Julich GmbH, Garching (Germany)
Univ. Grenoble Alpes, Grenoble (France)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
Rice Univ., Houston, TX (United States); Beijing Normal Univ., Beijing (China)

We use unpolarized and polarized neutron scattering to study the temperature and polarization dependence of low-energy magnetic fluctuations in nearly optimally doped NaFe_0.9785Co_0.0215As, with coexisting superconductivity (T_c ≈ 19 K) and weak antiferromagnetic order (T_N ≈ 30 K, ordered moment ≈ 0.02μ_B/Fe). A single spin resonance mode with intensity tracking the superconducting order parameter is observed, although energy of the mode only softens slightly upon approaching T_c. Polarized neutron scattering reveals that the single resonance is mostly isotropic in spin space, similar to overdoped NaFe_0.935Co_0.045As but different from optimal electron-, hole-, and isovalently doped BaFe₂As₂ compounds, all featuring an additional prominent anisotropic component. Spin anisotropy in NaFe_0.9785Co_0.0215As is instead present at energies below the resonance, which becomes partially gapped below T_c, similar to the situation in optimally doped YBa₂Cu₃O_6.9. Here, our results indicate that anisotropic spin fluctuations in NaFe1–xCoxAs appear in the form of a resonance in the underdoped regime, become partially gapped below T_c near optimal doping, and disappear in overdoped compounds.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1409258

Journal Information:: Physical Review B, Vol. 96, Issue 18; ISSN 2469-9950

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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Title: Temperature and polarization dependence of low-energy magnetic fluctuations in nearly optimally doped ${NaFe}_{0.9785} {Co}_{0.0215} As$