Strong oxygen-mass dependence of the thermal-expansion coefficient in the manganites (La1-xCax)(1-y)Mn1-yO3

被引：80
|
作者：
Zhao, GM [1 ]
Hunt, MB [1 ]
Keller, H [1 ]
机构：
[1] UNIV ZURICH, INST PHYS, CH-8057 ZURICH, SWITZERLAND
来源：
PHYSICAL REVIEW LETTERS | 1997年 / 78卷 / 05期
关键词：
D O I：
10.1103/PhysRevLett.78.955
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Thermal-expansion and magnetic susceptibility measurements were performed on oxygen-isotope substituted manganites (La1-xCax)(1-y)Mn1-yO3 with a Mn4+ concentration of similar to 33%. The linear thermal-expansion coefficient beta(T) exhibits an asymmetric peak at the Curie temperature T-c, indicative of a second-order ferromagnetic transition. Upon replacing O-16 with O-18, Te is lowered by about 10 K, while the second-order jump in the thermal-expansion coefficient [Delta beta(T-c)] is raised by about 20%. Such a ''colossal'' oxygen-isotope effect on Delta beta(T-c) is very surprising, but can be explained quantitatively on the basis of double exchange and strong polaronic effects.
引用
收藏
页码：955 / 958
页数：4
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