(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 Sr(0.98)Mn(0.02)TiO(3) ceramics. Sr-site substituted Mn2+ ions are at the origin of both a polar and a spin glass with glass temperatures T(g) approximately equal to 38 K and < or =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.
Shvartsman
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VV
Angewandte Physik, Universität Duisburg-Essen, Lotharstrasse 1, Duisburg, Germany.
Bedanta
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S
Borisov
P
P
Kleemann
W
W
Tkach
A
A
Vilarinho
P M
PM