### Session Z36: Focus Session: Bulk Properties of Complex Oxides -- 4d and 5d Systems

11:15 AM–2:15 PM, Friday, March 19, 2010
Room: E146

Chair: Rongying Jin, Louisiana State University

Abstract ID: BAPS.2010.MAR.Z36.3

### Abstract: Z36.00003 : Continuous metal-insulator transition at 410 K of the antiferromagnetic perovskite NaOsO$_3$

11:39 AM–11:51 AM

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#### Authors:

K. Yamaura
(National Institute for Materials Science, Japan)

Y.G. Shi
(National Institute for Materials Science, Japan)

Y.F. Guo
(National Institute for Materials Science, Japan)

S. Yu
(National Institute for Materials Science, Japan)

M. Arai
(National Institute for Materials Science, Japan)

A.A. Belik
(National Institute for Materials Science, Japan)

A. Sato
(National Institute for Materials Science, Japan)

E. Takayama-Muromachi
(National Institute for Materials Science, Japan)

H.F. Tian

H.X. Yang

J.Q. Li
Newly synthesized perovskite NaOsO$_3$ shows a Curie-Weiss metallic nature at high temperature and suddenly goes into an antiferromagnetically insulating state at 410 K on cooling. Electronic specific heat at the low temperature limit is absent, indicating that the band gap fully opens. $In situ$ observation in electron microscopy undetected any lattice anomalies in the vicinity of the transition temperature. It is most likely that the antiferromagnetic correlation plays an essential role in the gap opening. Use of the Advanced Photon Source was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. This research was supported in part by the WPI Initiative on Materials Nanoarchitectonics from MEXT, Japan, and the Grants-in-Aid for Scientific Research (20360012) from JSPS.