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首页> 外文期刊>Solid State Communications >Asymmetrical phase separation in Nd_(0.25)La_(0.25)Ca_(0.5)MnO_3
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Asymmetrical phase separation in Nd_(0.25)La_(0.25)Ca_(0.5)MnO_3

机译：Nd_（0.25）La_（0.25）Ca_（0.5）MnO_3中的不对称相分离

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摘要

The highly metastable region across the metal-insulator transition in Nd_(0.25)La_(0.25)Ca_(0.5)MnO_3 is probed by transport and magnetic measurements. The metal-insulator transition observed around 130 K is associated with large thermal hysteresis between temperatures 50-150 K. Observation of minor hysteresis loops across the region indicates coexistence of both metallic and insulating phases. The field-cooled heating and the zero-field-cooled heating susceptibilities deviate from each other from 205 K, signifying thermo-magnetic irreversibility arising from magnetic pinning and/or glassy magnetic behaviour. The magnetoresistance measured on the heating and cooling loops are found to be different in magnitude and nature. The cooling-cycle magnetoresistance was found to be highly irreversible with an open-ended hysteresis loop. We also observe change in the nature of the magnetic relaxation data on the heating and cooling protocols. This indicate strong thermal history dependence of magneto-transport behaviour in the present compound.
机译：Nd_（0.25）La_（0.25）Ca_（0.5）MnO_3中跨越金属-绝缘体跃迁的高度亚稳区域通过传输和磁测量进行探测。在130 K附近观察到的金属-绝缘体转变与温度在50-150 K之间的较大的热滞相关。在整个区域观察到较小的磁滞回线表明，金属相和绝缘相同时存在。场冷加热和零场冷加热磁化率彼此偏离205 K，这表明由磁钉扎和/或玻璃态磁行为引起的热磁不可逆性。发现在加热和冷却回路上测得的磁阻在大小和性质上是不同的。发现具有开放式磁滞回线的冷却循环磁阻是高度不可逆的。我们还观察到加热和冷却方案中磁弛豫数据性质的变化。这表明在本发明化合物中，磁传输行为具有很强的热历史依赖性。

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