Enhancement of magnetic critical scattering and nematic spin correlations in uniaxial strained Ba(Fe0.975Co0.025)2As2 (TS=103K, TN=98K)
A small in-plane external uniaxial pressure has been widely used as an effective method to acquire single domain iron pnictides, it can also serve as an effective symmetry breaking field in the study of in-plane electronic nematic in underdoped samples. In our previous polarized neutron scattering experiments on unstrained BaFe2As2, the longitudinal mode (Ma) dominates the low-energy spin fluctuations and diverges at TN, while the transverse modes (Mb, Mc) evolve smoothly and change less across TN. However, based on our latest result on BAFe2As2 with uniaxial pressure, not only the longitudinal mode Ma diverges, but the transverse mode Mc perpendicular to the applied uniaxial strain also exhibits a clear diverging behavior, indicating uniaxial strain induce a c-axis magnetic moment, or simply affect the magnetic critical scattering. Because the enhancement of Mc indicates that similar electronic nematic materials may offer a novel route for magneto-mechanical control, we proposal study the underlying origin and its connection to electronic nematic with polarized neutron on underdoped Ba(Fe0.975Co0.025)2As2, where the nematic reaches a maximum and the TS and TN are well separated.
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The recommended format for citing this dataset in a research publication is in the following format:
Xingye Lu; ENDERLE Mechthild; HANSEN Ursula Bengaard; J. T. Park; Yixi Su and Long Tian. (2021). Enhancement of magnetic critical scattering and nematic spin correlations in uniaxial strained Ba(Fe0.975Co0.025)2As2 (TS=103K, TN=98K). Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-02-592
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