Magneto-electric anomalies in bamnf4
Magneto-electric anomalies in bamnf4
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DOI：
10.1080/00150199408213372
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发表时间：
1994-11
期刊：
影响因子：
0.8
通讯作者：
J. Scott;D. Tilley
中科院分区：
文献类型：
--
作者：
J. Scott;D. Tilley
根据沿着a轴的介电异常，对BaMnF 4在4.2 K下的二阶磁电张量进行了理论评估，得出β xzz = 1.0 × 10−19 sA−1，而Sciau等人的直接测量值为1.6 × 10−19 sA −1。这种±50%范围内的数值一致性和Δe（T）的温度依赖性（Δ e（T）随亚晶格磁化强度的平方变化（与Bonfim和Gehring的一般理论雅阁）--平均场S = 5/2依赖性--证实了所用朗道理论分析的有效性。给出了无公度相线性磁电效应两两抵消的几何解释。
Abstract A theoretical evaluation of the second-order magnetoelectric tensor for BaMnF4 at 4.2 K based upon dielectric anomalies along the a-axis yields β xzz = 1.0 × 10−19 sA−1, compared with the direct measurement by Sciau et al. of 1.6 × 10−19 sA−1. This numerical agreement within ±50% and the temperature dependence of Δe(T), which varies as the square of the sublattice magnetization (in accord with the general theory of Bonfim and Gehring)—a mean-field S = 5/2 dependence—confirms the validity of the Landau-theory analysis used. A geometric argument is given to explain the pairwise cancellation of the linear magnetoelectric effect in the incommensurate phase.