Discrepancies between infrared and dc resistivities of La0.7Ca0.3MnO3 samples

被引：44
作者：
Kim, KH [1 ]
Gu, JY [1 ]
Choi, HS [1 ]
Eom, DJ [1 ]
Jung, JH [1 ]
Noh, TW [1 ]
机构：
[1] SEOUL NATL UNIV,CONDENSED MATTER RES INST,SEOUL 151742,SOUTH KOREA
来源：
PHYSICAL REVIEW B | 1997年 / 55卷 / 07期
关键词：
D O I：
10.1103/PhysRevB.55.4023
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Infrared (IR) reflectivity spectra were measured in temperatures between 160 K and 290 K for polycrystalline La0.7Ca0.3MnO3 (LCMO) samples. Though all the samples showed nearly the same reflectivities, their de resistivities were varied by more than one order of magnitude. Their resistivities predicted by the Hagen-Rubens relation from the IR spectra were much lower than the values from de measurements, but they were very close to those of epitaxially grown LCMO films. Our results suggest that de transport properties of LCMO might be strongly influenced by intergranular resistance, but that the IR responses reflect intrinsic properties of the LCMO grains.
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页码：4023 / 4026
页数：4
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