Stress-induced metallic behavior under magnetic field in Pr$_{1-x}$Ca$_{x}$MnO$_{3}$ (x = 0.5 and 0.4) thin films
Stress-induced metallic behavior under magnetic field in Pr$_{1-x}$Ca$_{x}$MnO$_{3}$ (x = 0.5 and 0.4) thin films
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Pr$_{1-x}$Ca$_{x}$MnO$_{3}$ (x = 0.5 和 0.4) 薄膜中应力诱导的金属行为
DOI：
10.1063/1.1357134
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
B. Raveau
中科院分区：
文献类型：
--
作者：
W. Prellier;C. Simon;B. Mercey;M. Hervieu;A. Haghiri;D. Saurel;P. Lecoeur;B. Raveau
我们研究了巨大磁阻锰氧化物薄膜中基底的存在引起的应力对结构、电阻和磁性的影响。由于与电荷排序 (CO) 相关的小结构畸变和电阻特性之间的强耦合，衬底的存在阻碍了 Pr$_{0.5}$Ca$_{0.5}$MnO$_{3}$ 中电荷排序的充分发展，特别是在非常薄的薄膜中。对于较厚的薄膜，CO 态存在，但尚未完全发展。相应地，在 SrTiO$_{3}$ 基底上抑制 CO 所需的磁场从 25 Tesla 急剧下降到约 5 Tesla。我们还通过研究 Pr$_{0.6}$Ca$_{0.4}$MnO$_{3}$ 的情况来研究掺杂水平的影响。
We have investigated the role of the stress-induced by the presence of the substrate in thin films of colossal magnetoresistive manganites on structural, resistive and magnetic properties. Because of the strong coupling between the small structural distortions related to the charge-ordering (CO) and the resistive properties, the presence of the substrate prevents the full developpement of the charge ordering in Pr$_{0.5}$Ca$_{0.5}$MnO$_{3}$, especially in the very thin films. For thicker films, the CO state exists, but is not fully developped. Correlatively, the magnetic field which is necessary to suppress the CO is decreased drastically from 25 Tesla to about 5 Tesla on SrTiO$_{3}$ substrates. We have also investigated the influence of the doping level by studying the case of Pr$_{0.6}$Ca$_{0.4}$MnO$_{3}$.