Theoretical Study of the Multiferroic Properties of Pure and Ion-Doped Pb 5 M 3 F 19 , M = Fe, Cr, Al.

Autor: Apostolova, Iliana N., Apostolov, Angel T., Wesselinowa, Julia M.
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Zdroj: Materials (1996-1944); Sep2024, Vol. 17 Issue 18, p4476, 9p
Abstrakt: In a first theoretical investigation of the multiferroic properties of Pb 5 Fe 3 F 19 (PFF) and Pb 5 Cr 3 F 19 (PCF), we analyze their magnetic, ferroelectric, and dielectric characteristics as functions of temperature, magnetic field, and ion doping concentration using a microscopic model and Green's function theory. The temperature-dependent polarization in PFF and PCF shows a distinctive kink at the magnetic Neel temperature T N , which vanishes when an external magnetic field is applied, indicating the multiferroic behavior of these two compounds. Ion doping effectively tunes the properties of PFF and PCF. In PFF, Cr ion doping leads to a decrease in the Neel temperature T N , while Cr and Al ion doping lowers the ferroelectric Curie temperature T C . In the case of PCF, we observe the enhancement of T C by Fe ion doping and the reduction by Al ion doping. The last result coincides well quantitatively with the experimental data. Additionally, the magnetodielectric coefficient of PFF is enhanced with the increasing magnetic field. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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