Polarized neutron scattering study of the nematic spin correlations in uniaxial strained BaFe2As2
The electronic nematic in iron pnictides has been discovered in many properties and thought to be crucial for understanding the origin of the intertwined orders in iron pnictides. It has also been discovered in spin excitation. Our previous experiment has observed clear spin excitation difference between Q1 = (1, 0) and Q2 = (0, 1) in the tetragonal state of uniaxial strained BaFe2-xNixAs2 (termed nematic spin correlations). This nematic spin correlation has been proposed to be essential for sorting out the origin of the electronic nematic. One effective way to obtain a complete understanding of the nematic spin correlations is to study its structure in spin space, that is, the spin fluctuations along a, b and c axes (Ma, Mb, Mc) of uniaxial strained sample and its temperature dependence across TN. Moreover, nuclear magnetic resonance measurements on strained sample suggested that the spin nematic along c axis diverges at TN while its in-plane counterparts not, indicating a strong coupling between strain and c axis spin polarization. To sort out the nature of the nematic spin correlations and the coupling, we propose to study strained BaFe2As2 by polarized neutron scattering.
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Xingye Lu; LIU Panpan; J. T. Park; SCHMALZL Karin; Yixi Su and Long Tian. (2018). Polarized neutron scattering study of the nematic spin correlations in uniaxial strained BaFe2As2. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-02-531
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