Spin-glass transition in the spin–orbit-entangled Jeff = 0 Mott insulating double-perovskite ruthenate

We have successfully synthesized new Ru 4+ double perovskite oxides SrLaInRuO 6 and SrLaGaRuO 6 , which are expected to be a spin–orbit coupled J eff  = 0 Mott insulating ground state. Their magnetic susceptibility is much significant than that expected for a single Ru 4+ ion for which exchange coup...

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Bibliographic Details
Published in:Scientific reports 2022-02, Vol.12 (1), p.2429-2429, Article 2429
Main Authors: Yatsuzuka, Hayato, Haraguchi, Yuya, Matsuo, Akira, Kindo, Koichi, Katori, Hiroko Aruga
Format: Article
Language:English
Subjects:
639/766
639/766/119
639/766/119/997
Crystal structure
Expected values
Humanities and Social Sciences
Low temperature
Magnetic susceptibility
multidisciplinary
Physics
Science
Science (multidisciplinary)
Solid state physics
Temperature
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Summary:We have successfully synthesized new Ru 4+ double perovskite oxides SrLaInRuO 6 and SrLaGaRuO 6 , which are expected to be a spin–orbit coupled J eff  = 0 Mott insulating ground state. Their magnetic susceptibility is much significant than that expected for a single Ru 4+ ion for which exchange coupling with other ions is negligible. Their isothermal magnetization process suggests that there are about 20 percent isolated spins. These origins would be the Ru 3+ /Ru 5+ magnetic defects, while the regular Ru 4+ sites remain nonmagnetic. Moreover, SrLaGaRuO 6 shows a spin-glass-like magnetic transition at low temperatures, probably caused by isolated spins. The observed spin-glass can be interpreted by the analogy of a dilute magnetic alloy, which can be seen as a precursor to the mobile J eff  = 1 exciton as a dispersive mode as predicted.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-022-06467-2