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

引用

页数：6

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