HALL-EFFECT SIGN ANOMALY AND SMALL-POLARON CONDUCTION IN (LA1-XGDX)(0.67)CA0.33MNO3

Authors
JAIME M HARDNER HT SALAMON MB RUBINSTEIN M DORSEY P EMIN D
Citation
M. Jaime et al., HALL-EFFECT SIGN ANOMALY AND SMALL-POLARON CONDUCTION IN (LA1-XGDX)(0.67)CA0.33MNO3, Physical review letters, 78(5), 1997, pp. 951-954
Citations number
17
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
78
Issue
5
Year of publication
1997
Pages
951 - 954
Database
ISI
SICI code
0031-9007(1997)78:5<951:HSAASC>2.0.ZU;2-#
Abstract
The Hall coefficient of Gd-doped La2/3Ca1/3MnO3 exhibits Arrhenius beh avior over a temperature range from 2T(c) to 4T(c), with an activation energy very close to 2/3 that of the electrical conductivity. Althoug h both the doping level and thermoelectric coefficient indicate holeli ke conduction, the Hall coefficient is electronlike. This unusual resu lt provides strong evidence in favor of small-polaronic conduction in the paramagnetic regime of the manganites.