Studies on magnetic and calorimetric properties of double perovskites Ba2HoRuO6 and Ba2HoIrO6 |
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Authors: | Yukio Hinatsu Yuki Izumiyama Abdolali Alemi Makoto Wakeshima Yukio Morii |
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Institution: | a Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japanb Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki 319-1195, Japan |
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Abstract: | Magnetic properties of double perovskite compounds Ba2HoRuO6 and Ba2HoIrO6 have been reported. Powder X-ray and neutron diffraction measurements show that these compounds have a cubic perovskite-type structure with the space group and the 1:1 ordered arrangement of Ho3+ and Ru5+ (or Ir5+) over the 6-coordinate B sites. Results of the magnetic susceptibility and specific heat measurements show that Ba2HoRuO6 exhibits two magnetic anomalies at 22 and 50 K. Analysis of the temperature dependence of magnetic specific heat indicates that the anomaly at 50 K is due to the antiferromagnetic ordering of Ru5+ ions and that the anomaly at 22 K is ascribable to the magnetic interaction between Ho3+ ions. Neutron diffraction data collected at 10 and 35 K show that the Ba2HoRuO6 has a long range antiferromagnetic ordering involving both Ho3+ and Ru5+ ions. Each of their magnetic moments orders in a Type I arrangement and these magnetic moments are anti-parallel in the ab-plane with each other. The magnetic moments are aligned along the c-direction. On the other hand, Ba2HoIrO6 is paramagnetic down to 1.8 K. |
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Keywords: | Magnetic properties Specific heat Perovskite Magnetic structure Ruthenium Holmium Iridium |
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