2016/02/29 by R. Vilarinho, E. Queiros, E. C. Queirós +11 · 15 citations
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Chemistry #Condensed matter physics #Crystal structure #Crystallography #Dielectric #Doping #Electric field #Electron #Ferroelectricity #Magnetic and transport properties of perovskites and related materials #Magnetic field #Magnetization #Magnetoelectric effect #Materials science #Multiferroics #Multiferroics and related materials #Nuclear magnetic resonance #Octahedron #Optoelectronics #Physical chemistry #Physics #Polar #Polarization (electrochemistry) #Polarization density #cond-mat.str-el
paper · pdf · doi:10.1016/j.jmmm.2017.04.085
published in Journal of Magnetism and Magnetic Materials 439, 167-172 (Elsevier BV) · 11 pages, 4 figures
openalex publication_date 2017/05/04 · arxiv created 2017/05/26 · arxiv updated 2017/05/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
This work addresses the effect of substituting Mn3+ by Fe3+ at the octahedral site of TbMnO3 on the magnetic phase sequence, ferroelectric and magnetoelectric properties, keeping the Fe3+ concentration below 5%. The temperature dependence of the specific heat, dielectric permittivity and electric polarization was studied as a function of Fe3+ concentration and applied magnetic field. From the experimental results a strong decrease of the electric polarization with increasing Fe3+ substitution is observed, vanishing above a concentration of 4%. However, within this range, a significant increase of the magnetic sensitivity of the electric polarization is obtained by increasing Fe3+ concentration. Above that value, a non-polar, weak ferromagnetic phase emerges, in good agreement with the predictions of the Dzyalowshinskii-Moriya model. This behavior reveals the crucial effect of Fe3+ substitution in octahedral sites on the magnetic phase sequence, polar and magnetoelectric behavior of the TbMn1-xFexO3 system. From the results obtained in this work, it is understood that this behavior is not associated with the eg electronic configuration, but instead to the competition between ferromagnetic and antiferromagnetic interactions, which is very sensitive to both local fields and distortions.