[Paper Review] Anomalous Antiferromagnetism in RuO2 [1]

As the schedule of my lab, las week (2020/09/14) was my turn of a new paper review section. The paper of this time was about RuO2, an interesting oxide and Resonant X-ray Scattering, a novel technique in research on solid materials. The Comin lab (the lab published this paper) at MIT is one of the pioneer groups focusing on this new experimental methods. The RXS is an extremely useful alternative to ARPES in some particular cases, which is already very well-known.

The ruthenium-based oxides are very famous for a wide range of exotic properties. Some prominent examples are Sr2RuO4 for its unconventional superconductivity or other calcium ruthenates (Ca2RuO4 and Ca3Ru2O7) for their magnetic behaviors. RuO2 was actually investigated since 70s, but due to the limited experimental methods, the real nature of the oxide was not clearly identified. In fact, it was thought to be paramagnetic. However, recent research has found that the real properties of RuO2 indicate its novel nature. In this paper by the powerful tool of RXS, Z.H. Zhu et al. had confirmed a strong antiferromagnetic ground state of RuO2, which persists up to very high temperature. We all know that spintronics is flourishing recently with the discovery of antiferromagnetic semiconductors. Antiferromagnetic metals belong to another class of materials, whose future is very promising for the advancement of technology. And with this paper, RuO2 is a bright candidate.

Please find my slides bellow for more details.

[1] Z. H. Zhu et al., Physical Review Letters 122, 017202 (2019)

論文紹介_Duy_200914.pdf

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