Can the ferroelectric soft mode trigger an antiferromagnetic phase transition?

• Type: Article in International Scientific Journal
• Date: 2023

Authors

Maia, A (Author) Other; Kadlec, C (Author) Other; Savinov, M (Author) Other; Vilarinho, R (Author) Other; Agostinho Moreira, JA (Author) FCUP; Bovtun, V (Author) Other; Kempa, M (Author) Other; Misek, M (Author) Other; Kastil, J (Author) Other; Prokhorov, A (Author) Other; Manak, J (Author) Other; Belik, AA (Author) Other; Kamba, S (Author) Other

Journal

Title: Journal of the European Ceramic Society

Vol. 43

Pages: 2479-2487

ISSN: 0955-2219

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 1 Citation

Scopus

Other information

Authenticus ID: P-00X-RW0

DOI: 10.1016/j.jeurceramsoc.2022.12.067

Abstract (EN): Type-II multiferroics, where spin interactions induce a ferroelectric polarization, are interesting for new device functionalities due to large magnetoelectric coupling. We report on a new type of multiferroicity in the quadruple-perovskite BiMn3Cr4O12, where an antiferromagnetic phase is induced by the structural change at the ferroelectric phase transition. The displacive nature of the ferroelectric phase transition at 125 K, with a crossover to an order-disorder mechanism, is evidenced by a polar soft phonon in the THz range and a central mode. Dielectric and pyroelectric studies show that the ferroelectric critical temperature corresponds to the previously reported Ne ' el temperature of the Cr3+ spins. An increase in ferroelectric polarization is observed below 48 K, coinciding with the Ne ' el temperature of the Mn3+ spins. This increase in polarization is attributed to an enhanced magnetoelectric coupling, as no change in the crystal symmetry below 48 K is detected from infrared and Raman spectra.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9