In this work we investigate the effect of Ag⁺ doping at Sr²⁺ site in La_0.57Nd_0.1Sr_0.33−xAg_xMnO₃ (LNSAMO_x, x = 0.00 and 0.15) system on the magnetic and magneto-electrical properties. The variation of the magnetization M versus temperature T, at 0.05 T, reveals a ferromagnetic–paramagnetic transition for all samples. All samples undergo a sharp metal–semiconductor transition at a temperature T_ρ, accompanying the ferromagnetic–paramagnetic transition. The maximum values of resistivity temperature coefficient (TCR) and magneto-resistance were 2.5% K⁻¹ and 63% at room temperature of 290 K and 305 K, respectively. The TCR value is considered as an important factor in determining the sensitivity of uncooled infrared bolometers. Most interesting is that the adjustment of the low-temperature range ρ–T revealed the presence of low-temperature peaks in the resistivity curves, attributed to the diffusion effects of grain boundaries, electron–electrons, electron–magnon, electron–phonons and the interactions between them. Overall, LNSAMO_x polycrystalline ceramics appear promising for uncooled infrared detectors, magnetic memories or magnetic storage devices.

中文翻译：

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La 0.57 Nd 0.1 Sr 0.33-x Ag x MnO 3（0.00和0.15）锰中Ag掺杂Sr场的磁输运性质

在这项工作中，我们研究了在La _0.57 Nd _0.1 Sr _{0.33- x} Ag _x MnO ₃（LNSAMO _x，x  = 0.00和0.15）系统中Sr ²⁺处Ag ⁺掺杂对磁和磁电性质的影响。磁化强度M与温度T的关系在0.05 T时变化，揭示了所有样品的铁磁-顺磁转变。所有样品进行在温度急剧金属-半导体过渡Ť _ρ，伴随着铁磁-顺磁过渡。在室温为290 K和305 K时，电阻率温度系数（TCR）和磁阻的最大值分别为2.5％K ^-1和63％。TCR值被认为是确定未冷却红外测辐射热计灵敏度的重要因素。最有趣的是，在低温度范围的调整ρ - Ť显示低温峰的存在在电阻率曲线，归因于晶界，电子电子，电子磁振子，电子声子和所述的扩散效应他们之间的互动。总体而言，LNSAMO _x 多晶陶瓷有望用于未冷却的红外探测器，磁存储器或磁存储设备。