The polycrystalline samples (La1−xNdx)2/3(Ca1−ySry)1/3MnO3 were prepared by the solid-state reaction method. Magnetization measurements versus temperature were performed in order to investigate the magnetic properties such as the metamagnetic transition. The transition temperature estimated from the maximum of dM/dH is found sensitive to disorder σ2 leading to the formation of an inhomogeneous metastable state and to subsequent magnetization jumps. The peak temperature coefficient of the resistivity improved significantly from 1.54 to 8.21% K−1 due to the increase in disorder. These findings suggest that (La1−xNdx)2/3(Ca1−ySry)1/3MnO3 ceramics can be used to prepare uncooled infrared bolometers.

中文翻译：

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无序对 (La1−xNdx)2/3(Ca1−ySry)1/3MnO3 陶瓷变磁行为消失和电阻率温度系数增强的影响

多晶样品 (La1-xNdx)2/3(Ca1-ySry)1/3MnO3 通过固相反应法制备。进行磁化测量与温度的关系，以研究磁特性，例如变磁转变。发现从 dM/dH 的最大值估计的转变温度对无序 σ2 敏感，导致形成不均匀的亚稳态和随后的磁化跳跃。由于无序的增加，电阻率的峰值温度系数从 1.54% K-1 显着提高到 8.21% K-1。这些发现表明 (La1−xNdx)2/3(Ca1−ySry)1/3MnO3 陶瓷可用于制备非制冷红外辐射热计。