Investigating the multiferroic properties of , their temperature and magnetic-field dependencies around the magnetic and ferroelectric phase transition temperatures and are analyzed using a microscopic model and Green's function technique. Near the Neel temperature , a kink in the specific heat and also in the phonon energy and damping due to strong anharmonic spin–phonon interaction is observed. The kink in disappears with increasing magnetic field h. The polarization shows also a small anomaly at and decreases with increasing magnetic field h. This behavior strongly suggests that exhibits multiferroic characteristics. A kink at can be seen in the real part of the dielectric constant , too. It should be noted that demonstrates a significant increase with increasing field strength h below , which is a pronounced magneto-dielectric effect. These findings qualitatively agree with the experimental data.

中文翻译：

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Cu2OCl2 的电学、介电和声子性质

研究多铁性，它们在磁相变温度和铁电相变温度附近的温度和磁场依赖性和使用微观模型和格林函数技术进行分析。接近尼尔温度，比热扭结以及声子能量和阻尼由于观察到强烈的非简谐自旋声子相互作用。扭结在随着磁场h的增加而消失。极化还显示出一个小异常并随着磁场h的增加而减小。这种行为强烈表明表现出多铁性特征。一个扭结可以看出介电常数的实部， 也。应当指出的是表明随着下面的场强h的增加而显着增加，这是明显的磁介电效应。这些发现在质量上与实验数据一致。