Spin excitation anisotropy in the paramagnetic tetragonal phase of BaFe2As2

Spin excitation anisotropy in the paramagnetic tetragonal phase of BaFe2As2 We use neutron polarization analysis to study temperature dependence of the spin excitation anisotropy in BaFe2As2, which has a tetragonal-to-orthorhombic structural distortion at Ts and antiferromagnetic (AF) phase transition at TN with ordered moments along the orthorhombic a axis below Ts≈TN≈136 K. In the paramagnetic tetragonal state at 160 K, spin excitations are isotropic in spin space with Ma=Mb=Mc, where Ma, Mb, and Mc are spin excitations polarized along the a-, b-, and c-axis directions of the orthorhombic lattice, respectively. On cooling towards TN, significant spin excitation anisotropy with Ma>Mb≈Mc develops below 3 meV with a diverging Ma at TN. The in-plane spin excitation anisotropy in the tetragonal phase of BaFe2As2 is similar to those seen in the tetragonal phase of its electron and hole-doped superconductors, suggesting that spin excitation anisotropy is a direct probe of doping dependence of spin-orbit coupling and its connection to superconductivity in iron pnictides. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Spin excitation anisotropy in the paramagnetic tetragonal phase of BaFe2As2

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Spin excitation anisotropy in the paramagnetic tetragonal phase of BaFe2As2

Abstract

We use neutron polarization analysis to study temperature dependence of the spin excitation anisotropy in BaFe2As2, which has a tetragonal-to-orthorhombic structural distortion at Ts and antiferromagnetic (AF) phase transition at TN with ordered moments along the orthorhombic a axis below Ts≈TN≈136 K. In the paramagnetic tetragonal state at 160 K, spin excitations are isotropic in spin space with Ma=Mb=Mc, where Ma, Mb, and Mc are spin excitations polarized along the a-, b-, and c-axis directions of the orthorhombic lattice, respectively. On cooling towards TN, significant spin excitation anisotropy with Ma>Mb≈Mc develops below 3 meV with a diverging Ma at TN. The in-plane spin excitation anisotropy in the tetragonal phase of BaFe2As2 is similar to those seen in the tetragonal phase of its electron and hole-doped superconductors, suggesting that spin excitation anisotropy is a direct probe of doping dependence of spin-orbit coupling and its connection to superconductivity in iron pnictides.
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Publisher
The American Physical Society
Copyright
Copyright © ©2017 American Physical Society
ISSN
1098-0121
eISSN
1550-235X
D.O.I.
10.1103/PhysRevB.96.020404
Publisher site
See Article on Publisher Site

Abstract

We use neutron polarization analysis to study temperature dependence of the spin excitation anisotropy in BaFe2As2, which has a tetragonal-to-orthorhombic structural distortion at Ts and antiferromagnetic (AF) phase transition at TN with ordered moments along the orthorhombic a axis below Ts≈TN≈136 K. In the paramagnetic tetragonal state at 160 K, spin excitations are isotropic in spin space with Ma=Mb=Mc, where Ma, Mb, and Mc are spin excitations polarized along the a-, b-, and c-axis directions of the orthorhombic lattice, respectively. On cooling towards TN, significant spin excitation anisotropy with Ma>Mb≈Mc develops below 3 meV with a diverging Ma at TN. The in-plane spin excitation anisotropy in the tetragonal phase of BaFe2As2 is similar to those seen in the tetragonal phase of its electron and hole-doped superconductors, suggesting that spin excitation anisotropy is a direct probe of doping dependence of spin-orbit coupling and its connection to superconductivity in iron pnictides.

Journal

Physical Review BAmerican Physical Society (APS)

Published: Jul 6, 2017

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