Polarized neutron investigation of non-bulk superconductor FeTe0.78Se0.22
We wish to continue our measurement of the anisotropy of the inelastic responses since this is key to understanding the pairing mechanism. We propose to measure the x=0.22 sample with polarized neutrons. Prior to the experiment, we will orient our x=0.22 sample with the c axis vertical to be able easily reach both, (0.5, 0, 0) and (0.5, 0.5, 0) position which are the magnetic ordering Q and the spin resonance Q, respectively. Using CRYOPAD, we will determine the diagonal elements of the polarization cross sections (6 channels) at two different temperatures (at 2 K and above TC at 20 K). This will enable us to calculate the responses along and perpendicular to the c axis. In addition, we wish to determine the energy dependencies and q profiles at these positions and follow their evolution with temperature. Based on experience from our last experiment on IN20 with polarized beam we estimate that we shall require 7 days of beam time.
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PROKES Karel; ARGYRIOU Dimitri; BAO Wei; HIESS Arno; LANDSGESELL Sven and WHEELER Elisa. (2012). Polarized neutron investigation of non-bulk superconductor FeTe0.78Se0.22. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1199
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