129th MSL Lecture (Dr Kazunari Yamaura)
| Date/Time | 2020/11/13 14:30 - |
|---|---|
| Place | This lecture will be held online. (Zoom webinar) |
| Organizer | Laboratory for Materials and Structures |
| Contact | Azuma-Yamamoto Lab (5315) |
| Language | English |
| Remarks | Registration form - Within 2 days after registration, we will send you an email with a link to join. - Contact for application : Office for Collaborative Research Projects, Laboratory for Materials and Structures （E-mail: kenkyushien@msl.titech.ac.jp） |
Subject & Detail
Speaker: Dr Kazunari Yamaura
(National Institute for Materials Science)
Title: New materials research and functional development of perovskite-related osmium oxides
In this talk, I will introduce recent activities of research of osmium oxides, which have been synthesized by a high-pressure and high-temperature method. The topic includes the double perovskite oxide Sr2CrOsO6 with a 3d3–5d3 configuration, which has been known to exhibit very high-TC ferrimagnetism (~725 K) at the endpoint of half-metallicity. Many substitution studies have been conducted theoretically and experimentally over the last two decades to shed more light on the open issue of how the 3d3–5d3 configuration generates the high-TC ferrimagnetic state and to accelerate development toward applications. In our study, we have succeeded in synthesizing a novel solid solution of Sr2Cr1–xNixOsO6 under high-pressure and high-temperature conditions. Sr2Cr0.5Ni0.5OsO6 exhibits magnetization six-fold greater (~1.2 μB/formula unit at 5 K) than that of Sr2CrOsO6. This enhancement is preserved even at room temperature. Other topics may also be introduced briefly.
