Sign Change of Thermopower at Low Temperatures in Nd0.7 ( Ca,Sr,Ba)0.3 MnO3
ZHOU Sheng-Ming1,2 , DONG Qiu-Zhao1 , ZHOU Gui-En1 ,ZHANG Yu-Heng1
1 Structure Research Laboratory, University of Science and Technology of China, Hefei 230026
2 Department of Physics, Anhui University, Hefei 230039
Sign Change of Thermopower at Low Temperatures in Nd0.7 ( Ca,Sr,Ba)0.3 MnO3
ZHOU Sheng-Ming1,2 ;DONG Qiu-Zhao1 ;ZHOU Gui-En1 ,ZHANG Yu-Heng1
1 Structure Research Laboratory, University of Science and Technology of China, Hefei 230026
2 Department of Physics, Anhui University, Hefei 230039
关键词 ：
72.15.Jf ,
71.38.+i ,
75.30.Et
Abstract ： The temperature dependence of thermopower and resistivity for the series of Nd0.7 ( Ca,Sr,Ba)0.3 MnO3 with a fixed average A-site cation radius have been measured. Infrared spectra revealed that the size differences between various A-site ions cause large local distortions of MnO6 octahedra. The thermopower is enhanced above metal-insulator transition temperature Tm and is reduced below Tm by increasing amount of A-site cation disorder. The sign change of thermopower induced by A-site cation disorder has been observed at low temperatures. The observed thermopower behaviors have been explained by Mott's formula and the effect of the spin disorder scattering.
Key words ：
72.15.Jf
71.38.+i
75.30.Et
出版日期: 2000-01-01
引用本文:
ZHOU Sheng-Ming;DONG Qiu-Zhao;ZHOU Gui-En;ZHANG Yu-Heng
. Sign Change of Thermopower at Low Temperatures in Nd0.7 ( Ca,Sr,Ba)0.3 MnO3 [J]. 中国物理快报, 2000, 17(1): 46-48.
0.7 ( Ca,Sr,Ba)0.3 MnO3 . Chin. Phys. Lett., 2000, 17(1): 46-48.
链接本文:
https://cpl.iphy.ac.cn/CN/
或
https://cpl.iphy.ac.cn/CN/Y2000/V17/I1/46
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