Monday, December 6, 2010, 3:00 pm — Small Seminar Room, Bldg. 510
Our group is currently conducting a new materials research toward superconducting and magnetic phenomena emerge in transition metal oxides. A hot material under our investigation is the complex osmium oxide, such as NaOsO3, Na2OsO4, and Ca3LiOsO6, prepared under a high temperature and high pressure condition [1-3]. They are newly synthesized or remain unstudied so far. The perovskite NaOsO3 shows a Curie-Weiss metallic nature at high temperature, and turns into an insulating state on cooling at 410 K [1]. The metal-insulator transition (MIT) is coupled with an antiferromagnetic transition. Electronic specific heat is absent at the low-temperature limit, indicating that the band gap fully opens. In situ observation in electron microscopy undetected any lattice anomalies associated with the MIT. Differential scanning calorimetry indicates that the MIT is the second-order phase transition. The features are likely comparable with what were observed for Cd2Os2O7 [4], except the transition temperature (TMIT = 226 K), and does not meet at all the MIT features observed for the LnNiO3 (Ln = Pr, Nd, Sm) [5]. In this talk we will overview progress of our research and discuss about a possible mechanism of the MIT of NaOsO3, for which the Slater transition scheme looks most likely.
Hosted by: Peter Khalifah
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