Structure and magnetism in Pr3RuO7 |
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| Affiliation: | 1. Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, SB RAS, Novosibirsk 630090, Russia;2. Functional Electronics Laboratory, Tomsk State University, Tomsk 634050, Russia;3. Laboratory of Semiconductor and Dielectric Materials, Novosibirsk State University, Novosibirsk 630090, Russia;4. Laboratory of Crystal Chemistry, Institute of Inorganic Chemistry, SB RAS, Novosibirsk 630090, Russia;5. Laboratory of Nanodiagnostics and Nanolithography, Institute of Semiconductor Physics, SB RAS, Novosibirsk 630090, Russia;6. Laboratory of Crystal Growth, Institute of Geology and Mineralogy, SB RAS, Novosibirsk 630090, Russia;7. Geology and Mineralogy Department, Novosibirsk State University, Novosibirsk 630090, Russia;8. Spintronics Laboratory, Saint Petersburg State University, Saint Petersburg 198504, Russia;9. Laboratory of Research Methods of Composition and Structure of Functional Materials, Novosibirsk State University, Novosibirsk 630090, Russia;1. Graduate School of Maritime Sciences, Kobe University, Fukaeminami, Higashinada, Kobe, Hyogo 658-0022, Japan;2. International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Namiki, Tsukuba, Ibaraki 305-0044, Japan;1. Academy of Scientific and Innovative Research (AcSIR), CSIR‐ National Institute for Interdisciplinary Science and Technology (CSIR-NIIST) Campus, Trivandrum 695019, India;2. Materials Science and Technology Division, National Institute for Interdisciplinary Science and Technology, CSIR, Trivandrum 695019, India;3. Institute of Materials Science, Technische Universität Darmstadt, 64287 Darmstadt, Germany;4. Department of Chemistry, Sree Kerala Varma College, Thrissur 680011, Kerala, India |
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| Abstract: | The crystal structure of the ordered fluorite, Pr3RuO7, was refined from powder neutron diffraction data in Cmcm. An interesting structural feature is the presence of relatively well separated zig-zag chains of corner sharing RuO6 octahedra, Ru–Ru interchain distance 6.61 Å vs. Ru–Ru intrachain distance of 3.76 Å. Magnetic susceptibility data show a Curie–Weiss behavior for T>225 K with C=5.96(4) emu K mol−1 and θc=+11(2) K. In an attempt to separate the contributions of Pr(3+) and Ru(5+), the properties of isostructural Pr3TaO7 were also measured, yielding C=4.63(3) emu K mol−1. Thus, the contribution of Ru(5+), 4d3, S=3/2, to the measured Curie constant is estimated to be 1.33 emu K mol−1, not far from the spin-only value of 1.87 emu K mol−1. This supports the view that the Ru 4d electrons are localized and magnetic, not itinerant. A susceptibility maximum at about 50 K is attributed to long-range magnetic order and this is substantiated by neutron diffraction data. There is little evidence for one-dimensional antiferromagnetic correlations in this material but behavior characteristic of short-range ferromagnetic correlations attributed to Pr–Ru exchange interactions are found in the temperature range 50–200 K, consistent with the positive θc. |
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