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arXiv 2006.00736cond-mat.str-el
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RFe0.5Cr 0.5O3(R = Er和Yb)化合物的磁热效应和自旋-声子关联

Magnetocaloric effect and spin-phonon correlations in RFe0.5Cr0.5O3 (R = Er and Yb) compounds

Kavita Yadav, Gurpreet Kaur, Mohit K. Sharma, K. Mukherjee

摘要:

本文报道了混合金属氧化物RFe_(0.5)Cr_(0.5)O_3(R = Er和Yb)的物理性质的研究结果。ErFe0.5Cr0.5O3在270 K附近发生反铁磁有序化,随后分别在150 K和8 K附近发生自旋重取向(SR)转变。相反,在YbFe 0.5Cr 0.5O3中,在36 K下注意到单个SR转变,低于AFM有序化温度280 K。在ErFe_(0.5)Cr_(0.5)O_3中,在第二次SR相变附近出现了一个很大的磁熵变(ΔSM)值~-12.4J/kg-K,而在YbFe_(0.5)Cr_(0.5)O_3中,该值被抑制。ErFe 0.5Cr 0.5O3和YbFe 0.5Cr 0.5O3在不同频率下随温度变化的介电常数揭示了这两种化合物中存在Debye类弛豫行为,这可能是由于Fe和Cr离子局域态之间的载流子跳跃效应。温度依赖的拉曼散射研究揭示,自旋-声子耦合在定义这些化合物的物理性质中起着至关重要的作用。

英文摘要:

We report the results of our investigation of the physical properties of mixed metal oxides RFe0.5Cr0.5O3 (R = Er and Yb). ErFe0.5Cr0.5O3 undergoes an antiferromagnetic ordering around 270 K followed by spin reorientation (SR) transitions around 150 and 8 K respectively. In contrast, in YbFe0.5Cr0.5O3 a single SR transition is noted at 36 K, below the AFM ordering temperature of 280 K. In ErFe0.5Cr0.5O3, a significant value of magnetic entropy change (ΔSM) ~ -12.4 J/kg-K is noted near the 2nd SR transition, however, this value is suppressed in YbFe0.5Cr0.5O3. Temperature dependent dielectric permittivity of ErFe0.5Cr0.5O3 and YbFe0.5Cr0.5O3 at different frequencies, reveal the presence of Debye-like relaxation behaviour in both compounds, which can be due to the effect of charge carrier hopping between localized states of Fe and Cr ions. Temperature dependent Raman scattering studies divulge that spin-phonon coupling plays a crucial role in defining the physical properties of these compounds.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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