Thermoelectronic properties of the strongly-correlated oxide BaIrO3

Author

Nakano, Tomohito ; Terasaki, Ichiro

Author_Institution

Dept. of Appl. Phys., Waseda Univ., Tokyo

fYear

2006

fDate

6-10 Aug. 2006

Firstpage

473

Lastpage

475

Abstract

We synthesized polycrystalline samples of Ba_1-xSr_xIrO₃ (0 les x les 0.2) using a solid-state reaction method, and measured their magnetization, resistivity and thermopower. The thermopower of BaIrO₃ slightly increases with decreasing temperature above T_C, and is suddenly enhanced below T_C = 180 K due to the pseudogap in the density of states. At 75 K, it reaches a maximum value of 230 muV/K. With increasing Sr concentration, the thermopower systematically decreases, accompanied by a slight decrease of T_C. For x = 0.2, the maximum value of the thermopower and T_C are 50 muV/K and 173 K, respectively. These results indicate that the gap is suppressed by chemical pressure due to the substitution of Sr for Ba

Keywords

barium compounds; electrical resistivity; magnetisation; strongly correlated electron systems; strontium compounds; thermoelectric power; 173 K; 180 K; 75 K; BaSrIrO₃; magnetization; resistivity; solid-state reaction; thermoelectricity; thermopower; Chemicals; Conductivity; Helium; Magnetic field measurement; Magnetization; Physics; Solid state circuits; Strontium; Temperature dependence; Thermoelectricity;

fLanguage

English

Publisher

ieee

Conference_Titel

Thermoelectrics, 2006. ICT '06. 25th International Conference on

Conference_Location

Vienna

ISSN

1094-2734

Print_ISBN

1-4244-0811-3

Electronic_ISBN

1094-2734

Type

conf

DOI

10.1109/ICT.2006.331318

Filename

4133333