Non-collinear magnetic structures of TbCoO3 and DyCoO3 |
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| Institution: | 1. Institute of Physics ASCR, Cukrovarnická 10, 162 00 Prague 6, Czech Republic;2. Neutron Scattering Science Division, ORNL, Oak Ridge, TN 37831, United States;2. Ragheb Isfahani Higher Education Institute, Basij Street, Isfahan, Iran;1. Graduate School of Material Science, University of Hyogo, 3-2-1 Kouto, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan;2. Faculty of Engineering, Shibaura Institute of Technology, Minuma-ku, Saitama 330-8570, Japan;3. Research Center for New Functional Materials, University of Hyogo, Japan;4. Japan Atomic Energy Agency (JAEA), SPring-8, Japan;5. National Institutes for Quantum and Radiological Science and Technology (QST), SPring-8, Japan;1. Department of Physics, Maulana Azad National Institute of Technology (MANIT), Bhopal 462051, Madhya Pradesh, India;2. Department of Physics, Barkatullah University, Bhopal 462026, Madhya Pradesh, India;3. Department of Energy Science and Engineering, IIT Bombay, Powai, Mumbai-400076, India;4. Rechargion Energy Pvt. Ltd. D 301, Yuthika Apartments, Baner, Pune 411045 MH, India;1. Department of Chemistry, Moscow State University, Leninskie Gory, House 1, Building 3, GSP-2, Moscow, 119992, Russia;2. Department of Chemistry and Chemical Biology, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada L8S 4M1;3. Université Grenoble Alpes, Inst NEEL, BP166, F-38042 Grenoble, France;4. CNRS, Institut NEEL, 25 Rue Des Martyrs, F-38042 Grenoble, France;1. Japan Atomic Energy Agency, Sayo, Hyogo, 679-5148, Japan;2. Okayama University, Okayama, 700-8530, Japan |
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| Abstract: | The orthoperovskites TbCoO3 and DyCoO3 with Co3+ in a non-magnetic low-spin state have been investigated by neutron diffraction down to 0.25 K. Magnetic ordering is evidenced below TN = 3.3 K and 3.6 K, respectively, and the ordered arrangements are of canted type, AxGy for TbCoO3 and GxAy for DyCoO3 in Bertaut's notation. The experiments are confronted with the first-principle calculations of the crystal field and magnetism of Tb3+ and Dy3+ ions, located in the Pbnm structure on sites of Cs point symmetry. Both these ions exhibit an Ising behavior, which originates in the lowest energy levels, in particular in accidental doublet of non-Kramers Tb3+ (4f8 configuration) and in ground Kramers doublet of Dy3+ (4f9) and it is the actual reason for the non-collinear AFM structures. Very good agreement between the experiment and theory is found. For comparison, calculations of the crystal field and magnetism for other systems with Kramers ions, NdCoO3 and SmCoO3, are also included. |
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| Keywords: | Neutron diffraction Crystal fields level splitting Magnetic structure |
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