Nematic spin correlations in the tetragonal state of strain-free detwinned BaFe2-xNixAs2
Recently, we have reported anisotropic spin excitation spectra between at Q1=(pi,0) and Q2=(0,pi) in the tetragonal-phase of detwinned parent and Ni-doped Ba122 system [X. Lu et al., Science 345 657 (2014)]. One of our key observation was that the inequivalent scattering intensity between Q1 and Q2 persists up to a temperature well above compounds' structural transition temperatures. Even though mechanical pressure did not alter Ts, there is an ongoing debate about an additional role of applied external pressure kept during measurements. To clarify such issue, under collaboration with ILL sample environment group we developed an in-situ pressure control sample stick which fits into orange cryostats at ILL. Combining this new device with Flatcone option at IN8, we will be able to measure magnetic excitations at Q1 and Q2 simultaneously in the detwinned single crystals without external pressure. Therefore, we request 10 days of beamtime at IN8 to carry out proposed measurements on parent (Ts = TN = 137K) and Ni-underdoped BaFe2As2 (Ts = 52, TN = 44K) compounds.
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J. T. Park; DAI Pengcheng; IVANOV Alexandre; Jiri Kulda and MAN Haoran. (2015). Nematic spin correlations in the tetragonal state of strain-free detwinned BaFe2-xNixAs2. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1434
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