Optical, dielectric and magnetic studies of phase transitions in BaMnF4
Optical, dielectric and magnetic studies of phase transitions in BaMnF4
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BaMnF4 相变的光学、介电和磁性研究
DOI：
10.1080/00150198508221393
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发表时间：
1985
期刊：
影响因子：
0.8
通讯作者：
J. Scott
中科院分区：
文献类型：
--
作者：
V. Gridnev;S. Kizhaev;O. Korshunov;B. B. Krichevtzov;P. Markovin;R. Pisarev;J. Scott
研究了TI=251K相变前后折射率、双折射率、旋光率和光活度的温度变化。该跃迁为轻微一阶跃迁，其阶参数β的临界指数为0,28±0,02。在50K及以下温度下观察到介电渗透率e2的异常下降，这被解释为磁有序的结果。在TN附近检测到e2的小峰，其振幅和在温标上的位置取决于沿b轴的磁场。
Abstract Temperature variations of the index of refraction, birefringence, rotation of optical indicatrix and optical activity have been studied below and above the phase transition at TI=251K. The transition was found to be of the slight first order with critical exponent of the order parameter β = 0,28 ± 0,02. Anomalous decrease of dielectric permeability e2 was observed at temperatures 50K and below and was interpreted as a consequence of magnetic ordering. Near TN a small peak of e2 was detected, its amplitude and position on the temperature scale being dependent upon magnetic field along b-axis.