Dresden 2020 – wissenschaftliches Programm
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MA 3.13: Vortrag
Montag, 16. März 2020, 12:45–13:00, HSZ 201
Cr and Ce magnetic ordering in CeCrO 3:revisited — •Neetika Sharma1, Reinhard K. Kremer1, Clemens Ritter2, and Fereidoon S. Razavi3 — 1Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany — 2Institute Laue Langevin, Grenoble 38000, France — 3Department of Physics, Brock University, St. Catharines, ON, L2S 3A1, Canada
We have investigated the magnetic structure of CeCrO 3 using neutron powder diffraction (NPD). CeCrO 3 crystallizes with the GdFeO3 structure-type (Pbnm). Earlier neutron diffraction measurements on CeCrO 3 have proposed a G-type afm structure for the Cr and a C-type for the Ce sublattice. The analysis of the magnetic structure for the Ce sublattice had been based on one magnetic peak (102) at d ∼ 3.152 Å. However, the proposed C-type coupling for Ce will generate primarily two magnetic Bragg peaks (100) at d ∼ 5.47 Å and (102) at d ∼ 3.152 Å. We have collected NPD patterns on a sample of CeCrO 3 using ILL’s D20 high-intensity medium resolution diffractometer and did observe the previously reported magnetic Bragg peak at d ∼ 3.152 Å, however significantly less intense than reported before. Simulations indicate that only the presence of magnetic coupling of C-type on the Cr- and the Ce- sublattices can lead to a situation where the magnetic peak (102) at d ∼ 3.152 Å is a lot stronger than the (100) Bragg peak at d ∼ 5.47Å. Following this proposal we have analyzed our neutron diffraction data very carefully at low temperature (1.5K), and conclude a CyGz type magnetic ordering for the Cr sub-lattice with a very small Cy-component and Cy type coupling for Ce - sublattice.