Ajay Tiwari, D. Chandrasekhar Kakarla, Wei-Lin Chen, C. Dhanasekhar, Ya-Jing Hu, Jiunn-Yuan Lin, Chin-Wei Wang, Ting-Wei Kuo, Arkadeb Pal, Mitch Ming-Chi Chou, Hung-Duen Yang
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引用次数: 0
摘要
报告了一种准一维自旋链化合物 FePbBiO4 的线性磁电（ME）特性。利用磁化、比热和明显的介电（ε′）反常现象验证了在≈23 K（TN1）和 12 K（TN2）时出现的两种不同的反铁磁（AFM）阶次。一个引人注目的现象是，在没有磁场（H）的情况下，检测不到热电流（Ipy）；然而，在 TN1 和 TN2 下，H 诱导的铁电极化（P）意外地发生了部分切换或逆转，这在施加正负电场（E）时得到了再现。由此产生的磁场和温度（H-T）相图说明了与 T 有关的 H 诱导的自旋重新定向和电 P。T、H、自旋动力学和晶格结构之间的相互作用至关重要，本文对其进行了定性讨论，并提出了对所观察到的 ME 性质的解释。
Observation of Magnetic Field-Induced and Partially Switchable Electric Polarization in Spin-Chain FePbBiO4
The linear magnetoelectric (ME) characteristics of a quasi-1D spin-chain compound, FePbBiO4, are reported. Two distinct antiferromagnetic (AFM) orders occurring at ≈23 K (TN1) and 12 K (TN2) are verified using magnetization, specific heat, and conspicuous dielectric (ε′) anomalies. A striking observation is that no pyrocurrent (Ipy) is detected in the absence of magnetic field (H); however, H-induced ferroelectric polarization (P) at TN1 and P unexpectedly partially switches or reverses below TN2 as reproduced by applying positive and negative electric fields (E). The resulting magnetic field and temperature (H-T) phase diagram illustrates T-dependent H-induced spin reorientation and electric P. The interaction between T, H, spin dynamics, and lattice structures is pivotal and is qualitatively discussed and proposed as an explanation for the observed ME nature.
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