Temperature dependence of non-Debye disorder in doped manganites

被引：38

作者：

Meneghini, C

Cimino, R

Pascarelli, S

Mobilio, S

Raghu, C

Sarma, DD

机构：

[1] INFM, I-16153 GENOA, ITALY

[2] E AMALDI UNIV ROMA TRE, DIPARTIMANTO FIS, I-00146 ROME, ITALY

[3] INDIAN INST SCI, SOLID STATE & STRUCT CHEM UNIT, BANGALORE 560012, KARNATAKA, INDIA

来源：

PHYSICAL REVIEW B | 1997年 / 56卷 / 07期

关键词：

D O I：

10.1103/PhysRevB.56.3520

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Ca-doped manganite La1-xCaxMnO3 samples with x=0.2 and 0.4 were investigated by extended x-ray absorption fine structure (EXAFS) as a function of temperature and preparation method. The samples exhibit characteristic resistivity change across the metal-insulator (MI) transition temperature whose shape and position depend on Ca-doping concentration and sample thermal treatment. EXAFS results evidenced an increase of nonthermal disorder at the MI transition temperature which is significantly correlated with the resistivity behavior.

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页码：3520 / 3523

页数：4

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