POLARONIC TRANSPORT-PROPERTIES IN LA1-XSRXFEO3 SYSTEMS (0.05-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-0.3)

被引:42
作者
JUNG, WH [1 ]
IGUCHI, E [1 ]
机构
[1] YOKOHAMA NATL UNIV,FAC ENGN,DEPT MECH ENGN & MAT SCI,HODOGAYA KU,YOKOHAMA,KANAGAWA 240,JAPAN
关键词
D O I
10.1088/0953-8984/7/6/022
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
Electrical transports in the La1-xSrxFeO3 system (0.05 less than or equal to x less than or equal to 0.3) was investigated as a function of temperature from 80 K to 350 K by dielectric properties, DC and AC conductivities. Two dielectric relaxation peaks appeared and their relative peak heights were closely related to the amount of Sr. The intensities of both these peaks were thermally activated. In every specimen, there was an Arrhenius relation between sigma T and T, the activation energy of which was nearly equal to the sum of the activation energy required for the dielectric relaxation and that for the thermal activation in the intensity of the relaxation peak The frequency dependences of AC conductivities obeyed an equation of sigma(omega) = A omega(s) and AC conductivities were independent of temperature below similar to 200 K at every applied frequency. These results were explained self consistently with small polarons of ligand holes (3d(5) ($) under bar L) which were transformed from the states of O 2p weight to the mixed Fe 3d-O 2p states with an increase in the covalent character as the amount of Sr increases, as confirmed by the soft-x-ray spectroscopies and XPS-experiments.
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页码:1215 / 1227
页数:13
相关论文
共 47 条
[1]   CONTROLLED-VALENCE PROPERTIES OF LA1-XSRXFEO3 AND LA1-XSRXMNO3 STUDIED BY SOFT-X-RAY ABSORPTION-SPECTROSCOPY [J].
ABBATE, M ;
DEGROOT, FMF ;
FUGGLE, JC ;
FUJIMORI, A ;
STREBEL, O ;
LOPEZ, F ;
DOMKE, M ;
KAINDL, G ;
SAWATZKY, GA ;
TAKANO, M ;
TAKEDA, Y ;
EISAKI, H ;
UCHIDA, S .
PHYSICAL REVIEW B, 1992, 46 (08) :4511-4519
[2]   DIELECTRIC PROPERTIES OF THIN FILMS OF ALUMINIUM OXIDE AND SILICON OXIDE [J].
ARGALL, F ;
JONSCHER, AK .
THIN SOLID FILMS, 1968, 2 (03) :185-&
[3]   POLARONS IN CRYSTALLINE AND NON-CRYSTALLINE MATERIALS [J].
AUSTIN, IG ;
MOTT, NF .
ADVANCES IN PHYSICS, 1969, 18 (71) :41-+
[4]   ELECTRONIC-STRUCTURE OF LA1-XSRXFEO3 [J].
CHAINANI, A ;
MATHEW, M ;
SARMA, DD .
PHYSICAL REVIEW B, 1993, 48 (20) :14818-14825
[5]  
Davis E. A., 1970, Journal of Non-Crystalline Solids, V2, P406, DOI 10.1016/0022-3093(70)90157-2
[6]  
DOMINIK LAK, 1967, PHYS REV, V163, P757
[7]   LATTICE RELAXATION AND SMALL-POLARON HOPPING MOTION [J].
EMIN, D .
PHYSICAL REVIEW B, 1971, 4 (10) :3639-&
[8]  
FROHLICH H, 1958, THEORY DIELECTRICS, P90
[9]   DIELECTRIC-PROPERTIES AND POLARONIC CONDUCTIVITY OF WO3 AND WXMO1-XO3 [J].
GEHLIG, R ;
SALJE, E .
PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES, 1983, 47 (03) :229-245
[10]   CRYSTALLOGRAPHIC STUDIES OF PEROVSKITE-LIKE COMPOUNDS .1. RARE EARTH ORTHOFERRITES AND YFEO3, YCRO3, YALO3 [J].
GELLER, S ;
WOOD, EA .
ACTA CRYSTALLOGRAPHICA, 1956, 9 (06) :563-568