EPR evidence for Jahn-Teller polarons in La1-xCaxMnO3+y

被引：9

作者：

Shengelaya, A

Zhao, GM

Keller, H

Muller, KA

机构：

[1] Physik-Institut, Universität Zürich

来源：

PHYSICA C | 1997年 / 282卷

关键词：

D O I：

10.1016/S0921-4534(97)00192-5

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We present the results of the electron paramagnetic resonance (EPR) study in the mixed valence perovskite La1-xCaxMnO3+y for O-16 and O-18 isotope substituted compounds. The characteristic differences observed in EPR intensity and linewidth for the two isotope samples can be explained by a model in which a bottlenecked spin relaxation takes place from the exchange-coupled constituent Mn4+ ions via the Mn3+ Jahn-Teller ions to the lattice. For x=0.2 the ferromagnetic exchange energy J exhibits a O-16/O-18 oxygen isotope effect of similar to-10%. The observed isotope effects provide the microscopic evidence for the formation of Jahn-Teller polarons in doped manganese perovskites.

引用

页码：190 / 193

页数：4

共 13 条

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