0436001 - FZÚ 2015 RIV US eng J - Journal Article
Kuzian, R. O. - Laguta, Valentyn - Richter, J.
Lieb-Mattis ferrimagnetic superstructure and superparamagnetism in Fe-based double perovskite multiferroics.
Physical Review. B. Roč. 90, č. 13 (2014), "134415-1"-"134415-13". ISSN 1098-0121. E-ISSN 2469-9969
R&D Projects: GA ČR GA13-11473S
Institutional support: RVO:68378271
Keywords : multiferroics * superantiferromagnetism * DFT calculations
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 3.736, year: 2014

An explicit mechanism of large superspin formation in double perovskites PbFe1/2M1/2O3 (M = Nb,Ta, and Sb) is considered. It is demonstrated that antiferromagnetically interacting Fe3+ (S = 5/2) ions may be arranged in a periodic superstructure that exhibits a long-range ferrimagnetic ordering below Tfe ≈ 5.6J1 (J1/kB ~ 50 K), which is close to room temperature. The ferrimagnetism of this superstructure is due to its geometry (so-called Lieb-Mattis ferrimagnetism), in contrast to the “usual” ferrimagnetism, which is due to the coupling of ions with different spin values.
Permanent Link: http://hdl.handle.net/11104/0239834