Chin. Phys. Lett.  2000, Vol. 17 Issue (1): 46-48    DOI:
Original Articles |
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
1Structure Research Laboratory, University of Science and Technology of China, Hefei 230026 2Department of Physics, Anhui University, Hefei 230039
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ZHOU Sheng-Ming, DONG Qiu-Zhao, ZHOU Gui-En et al  2000 Chin. Phys. Lett. 17 46-48
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Abstract The temperature dependence of thermopower and resistivity for the series of Nd0.7 ( Ca,Sr,Ba)0.3 MnO3with 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.



Keywords: 72.15.Jf      71.38.+i      75.30.Et     
Published: 01 January 2000
PACS:  72.15.Jf (Thermoelectric and thermomagnetic effects)  
  71.38.+i  
  75.30.Et (Exchange and superexchange interactions)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2000/V17/I1/046
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