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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Transport and magnetic properties of bulk and epitaxial thin film of Pr_(0.5)Sr_(0.5)MnO_3
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Transport and magnetic properties of bulk and epitaxial thin film of Pr_(0.5)Sr_(0.5)MnO_3

机译：Pr_（0.5）Sr_（0.5）MnO_3的块状和外延薄膜的输运和磁性

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摘要

A thin film of Pr_(0.5)Sr_(0.5)MnO_3 was prepared by laser ablation technique. The film (2500 A) shows a ferromagnetic (FM) ordering at 250 K for 200 G field followed by a second transition into an antiferromagnetic (AF) state around 150 K. By applying external fields, T_c shifts to higher temperatures and the magnetisation maximum at TN shifts to slightly lower temperatures. The onset of the AF behavior in all fields up to 5 T is accompanied by a splitting of the cooling and the warming magnetisation data. The M(T) curve of the bulk sample shows a temperature hysteresis indicating a first order transition. The thermopower (TEP) of the bulk sample remains negative in the temperature range of 77-300 K. We studied the piezoresistance effect of the film under quasi hydrostatic pressure up to 4 kbar. The specific heat data of the bulk sample also indicates FM and AFM transitions by showing small peaks at the respective temperatures.
机译：通过激光烧蚀技术制备了Pr_（0.5）Sr_（0.5）MnO_3薄膜。薄膜（2500 A）表示在200 K磁场下以250 K排列的铁磁（FM），然后在150 K附近再次转变为反铁磁（AF）态。通过施加外部磁场，T_c转变为更高的温度，磁化强度最大在TN处转变为稍低的温度。在高达5 T的所有磁场中，AF行为的开始都伴随着冷却和加热磁化数据的分裂。块状样品的M（T）曲线显示出温度滞后现象，指示一阶跃迁。大块样品的热功率（TEP）在77-300 K的温度范围内保持负值。我们研究了在高达4 kbar的准静水压下薄膜的压阻效应。散装样品的比热数据还通过在相应温度下显示小峰值来指示FM和AFM转变。

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