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Titolo:
Sign change of thermopower at low temperatures in Nd-0.7(Ca,Sr,Ba)(0.3)MnO3
Autore:
Zhou, SM; Dong, QZ; Zhou, GE; Zhang, YH;
Indirizzi:
Univ Sci & Technol China, Struct Res Lab, Hefei 230026, Peoples R China Univ Sci & Technol China Hefei Peoples R China 230026 6, Peoples R China Anhui Univ, Dept Phys, Hefei 230039, Peoples R China Anhui Univ Hefei Peoples R China 230039 s, Hefei 230039, Peoples R China
Titolo Testata:
CHINESE PHYSICS LETTERS
fascicolo: 1, volume: 17, anno: 2000,
pagine: 46 - 48
SICI:
0256-307X(2000)17:1<46:SCOTAL>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAGNETORESISTANCE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
13
Recensione:
Indirizzi per estratti:
Indirizzo: Zhou, SM Univ Sci & Technol China, Struct Res Lab, Hefei 230026, Peoples RChina Univ Sci & Technol China Hefei Peoples R China 230026 s R China
Citazione:
S.M. Zhou et al., "Sign change of thermopower at low temperatures in Nd-0.7(Ca,Sr,Ba)(0.3)MnO3", CHIN PHYS L, 17(1), 2000, pp. 46-48

Abstract

The temperature dependence of thermopower and resistivity for the series of Nd-0.7 (Ca, Sr, Ba)(0.3)MnO3 with a fixed average A-site cation radius [tau(A)] 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.

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Documento generato il 29/03/20 alle ore 01:14:52