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Title: Energy dependence of the spin excitation anisotropy in uniaxial-strained BaFe 1.9Ni 0.1As 2

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 0.1As 2 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 0.1As 2. 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) 2As 2 near optimal superconductivity, spin Ising-nematic correlations are likely the driving force for the resistivity anisotropy and associated electronic nematic correlations.
Authors:
 [1] ;  [2] ;  [3] ;  [1] ;  [3] ;  [3] ;  [1] ;  [1] ;  [4]
  1. Rice Univ., Houston, TX (United States)
  2. Rice Univ., Houston, TX (United States); Chinese Academy of Sciences (CAS), Beijing (China)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Chinese Academy of Sciences (CAS), Beijing (China)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 92; Journal Issue: 18; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1238741
Alternate Identifier(s):
OSTI ID: 1225398

Song, Yu, Lu, Xingye, Abernathy, Douglas L., Tam, David W., Niedziela, Jennifer L., Tian, Wei, Si, Qimiao, Dai, Pengcheng, and Luo, Huiqian. Energy dependence of the spin excitation anisotropy in uniaxial-strained BaFe1.9Ni0.1As2. United States: N. p., Web. doi:10.1103/PhysRevB.92.180504.
Song, Yu, Lu, Xingye, Abernathy, Douglas L., Tam, David W., Niedziela, Jennifer L., Tian, Wei, Si, Qimiao, Dai, Pengcheng, & Luo, Huiqian. Energy dependence of the spin excitation anisotropy in uniaxial-strained BaFe1.9Ni0.1As2. United States. doi:10.1103/PhysRevB.92.180504.
Song, Yu, Lu, Xingye, Abernathy, Douglas L., Tam, David W., Niedziela, Jennifer L., Tian, Wei, Si, Qimiao, Dai, Pengcheng, and Luo, Huiqian. 2015. "Energy dependence of the spin excitation anisotropy in uniaxial-strained BaFe1.9Ni0.1As2". United States. doi:10.1103/PhysRevB.92.180504. https://www.osti.gov/servlets/purl/1238741.
@article{osti_1238741,
title = {Energy dependence of the spin excitation anisotropy in uniaxial-strained BaFe1.9Ni0.1As2},
author = {Song, Yu and Lu, Xingye and Abernathy, Douglas L. and Tam, David W. and Niedziela, Jennifer L. and Tian, Wei and Si, Qimiao and Dai, Pengcheng and Luo, Huiqian},
abstractNote = {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 BaFe1.9Ni0.1As2 near optimal superconductivity (Tc = 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 BaFe1.9Ni0.1As2. Since this energy scale is considerably larger than the energy splitting of the dxz and dyz bands of uniaxial-strained Ba(Fe1–xCox)2As2 near optimal superconductivity, spin Ising-nematic correlations are likely the driving force for the resistivity anisotropy and associated electronic nematic correlations.},
doi = {10.1103/PhysRevB.92.180504},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 18,
volume = 92,
place = {United States},
year = {2015},
month = {11}
}