Energy dependence of the spin excitation anisotropy in uniaxial-strained BaFe1.9Ni0.1As2

Song, Yu; Lu, Xingye; Abernathy, Douglas L.; Tam, David W.; Niedziela, Jennifer L.; Tian, Wei; Si, Qimiao; Dai, Pengcheng; Luo, Huiqian

doi:10.1103/PhysRevB.92.180504

Title: Energy dependence of the spin excitation anisotropy in uniaxial-strained BaFe_1.9Ni_0.1As₂

Journal Article · Fri Nov 06 00:00:00 EST 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.180504· OSTI ID:1238741

Song, Yu ^[1]; Lu, Xingye ^[2]; Abernathy, Douglas L. ^[3]; Tam, David W. ^[1]; Niedziela, Jennifer L. ^[3]; Tian, Wei ^[3]; Si, Qimiao ^[1]; Dai, Pengcheng ^[1]; Luo, Huiqian ^[4]

Rice Univ., Houston, TX (United States)
Rice Univ., Houston, TX (United States); Chinese Academy of Sciences (CAS), Beijing (China)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Chinese Academy of Sciences (CAS), Beijing (China)

In this study, we use inelastic neutron scattering to study the temperature and energy dependence of the spin excitation anisotropy in uniaxial-strained electron-doped iron pnictide BaFe_1.9Ni_0.1As₂ near optimal superconductivity (T_c = 20K). Our work has been motivated by the observation of in-plane resistivity anisotropy in the paramagnetic tetragonal phase of electron-underdoped iron pnictides under uniaxial pressure, which has been attributed to a spin-driven Ising-nematic state or orbital ordering. Here we show that the spin excitation anisotropy, a signature of the spin-driven Ising-nematic phase, exists for energies below 60 meV in uniaxial-strained BaFe_1.9Ni_0.1As₂. Since this energy scale is considerably larger than the energy splitting of the d_xz and d_yz bands of uniaxial-strained Ba(Fe_1–xCox)₂As₂ near optimal superconductivity, spin Ising-nematic correlations are likely the driving force for the resistivity anisotropy and associated electronic nematic correlations.

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1238741

Alternate ID(s):: OSTI ID: 1225398

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 18; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 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: Energy dependence of the spin excitation anisotropy in uniaxial-strained BaFe_1.9Ni_0.1As₂