Unravelling the nature of ferromagnetic- paramagnetic phase transition and its bearing on colossal magnetoresistance in nanocrystalline La1-xCaxMnO3 (0.3 ≤ x ≤ 0.4)

被引：7
|
作者：
Bitla, Yugandhar [1 ]
Kaul, S. N. [1 ]
机构：
[1] Univ Hyderabad, Sch Phys, Hyderabad 500046, Andhra Pradesh, India
来源：
EPL | 2013年 / 103卷 / 05期
关键词：
FIELD-THEORY; MANGANITES; DISORDER;
D O I：
10.1209/0295-5075/103/57010
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The nature of the ferromagnetic (FM)-paramagnetic (PM) phase transition at T = T-C changes from first order to second order when the average crystallite size, d, falls below 100nm in optimally hole-doped nanocrystalline La1-xCaxMnO3. In zero field, the systems with d < 100 nm behave as a three-dimensional (3D) uniaxial dipolar ferromagnet in the asymptotic critical region but in finite fields, the asymptotic critical behavior changes over to that of a 3D Ising ferromagnet. How effectively polaron correlations couple magnetic degrees of freedom to the lattice decides the order of the FM-PM transition and the magnitude of colossal magnetoresistance (CMR). d alters the electron-lattice coupling and thereby enables the tuning of CMR over an unusually wide temperature range. Copyright (C) EPLA, 2013
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页数：6
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