Superspin glass phase and hierarchy of interactions in multiferroic PbFe.sub.1/2./sub.Sb.sub.1/2./sub.O.sub.3./sub.: an analog of ferroelectric relaxors?

0439529 - FZÚ 2015 RIV DE eng J - Článek v odborném periodiku
Laguta, Valentyn - Stephanovich, V. A. - Savinov, Maxim - Maryško, Miroslav - Kuzian, R. O. - Kondakova, I.V. - Olekhnovich, N.M. - Pushkarev, A.V. - Radyush, Yu.V. - Raevski, I. P. - Raevskaya, S. I. - Prosandeev, S. A.
Superspin glass phase and hierarchy of interactions in multiferroic PbFe_1/2Sb_1/2O₃: an analog of ferroelectric relaxors?
New Journal of Physics. Roč. 16, Nov (2014), "113041-1"-"113041-19". ISSN 1367-2630. E-ISSN 1367-2630
Grant CEP: GA ČR GA13-11473S
Institucionální podpora: RVO:68378271
Klíčová slova: multiferroics * spin glass * superantiferromagnetism * ferroelectrics * relaxors
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 3.558, rok: 2014

New perovskite multiferroic PbFe1/2Sb1/2O3 with a high degree (up to 0.9) of chemical ordering and unexpectedly high-temperature magnetic relaxor properties, which can barely be described within concepts of conventional spin glass physics was fabricated. The field-temperature phase diagram of this material, in the extremely wide temperature interval, contains the de Almeida–Thouless-type critical line. This was explained by the creation, at high temperatures of not less than 250 K, of giant superspins (SSs), owing, curiously enough, to the antiferromagnetic superexchange interaction. Analysis of the above complex physical picture was performed with the ab initio calculations and random field approach.
Trvalý link: http://hdl.handle.net/11104/0242794