(Sr, Mn)TiO3: A Magnetoelectric Multiglass

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 Sr0.98Mn0.02TiO3 ceramics. Sr-site substituted Mn2+ 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 SrTiO3, large higher order magnetoelectric coupling occurs between both glass systems.