Electric, dielectric and phonon properties of Cu2OCl2$\left(\text{Cu}\right)_{2} \left(\text{OCl}\right)_{2}$

Investigating the multiferroic properties of we analyze their temperature and magnetic field dependencies around the magnetic and ferroelectric phase transition temperatures and using a microscopic model and Green’s function technique. Near the Neel temperature we observe a kink in the specific heat and also in the phonon energy and damping due to strong anharmonic spin‐phonon interaction. 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. Our findings qualitatively agree with the experimental data.This article is protected by copyright. All rights reserved.