resumo
By close analogy with multiferroic materials with coexisting long-range electric and magnetic orders a "multiglass" scenario of two different glassy states is observed in Sr(0.98)Mn(0.02)TiO(3) ceramics. Sr-site substituted Mn(2+) ions are at the origin of both a polar and a spin glass with glass temperatures T(g)approximate to 38 K and <= 34 K, respectively. The structural freezing triggers that of the spins, and both glassy systems show individual memory effects. Thanks to strong spin-phonon interaction within the incipient ferroelectric host crystal SrTiO(3), large higher order magnetoelectric coupling occurs between both glass systems.
palavras-chave
STRONTIUM-TITANATE CERAMICS; SPIN-GLASSES; SUSCEPTIBILITY; MEMORY
categoria
Physics
autores
Shvartsman, VV; Bedanta, S; Borisov, P; Kleemann, W; Tkach, A; Vilarinho, PM
nossos autores
Oleksandr Tkach
Investigador
Paula Maria Lousada Silveirinha Vilarinho
Vice-DiretorProjectos
MULTICERAL - Multifunctional ceramic layers with high electromagnetoelastic coupling in complex geometries (MULTICERAL)
Functionalised Advanced Materials and Engineering of Hybrids and Ceramics - FAME (FAME)
agradecimentos
Financial support by the European Community within STREP NMP3-CT-2006-032616 (MULTICERAL) and the Network of Excellence FAME (Contract No. FP6-5001591), by Deutsche Forschungsgemeinschaft via KL306/38-3 and SFB 491, and by DAAD via Accoes Integradas Luso-Alemas is gratefully acknowledged.