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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

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(Sr,Mn)TiO3: a magnetoelectric multiglass.

V V Shvartsman¹, S Bedanta, P Borisov

¹Angewandte Physik, Universität Duisburg-Essen, Lotharstrasse 1, Duisburg, Germany.

Physical Review Letters

|November 13, 2008

Summary

This summary is machine-generated.

In Sr(0.98)Mn(0.02)TiO(3) ceramics, researchers observed a "multiglass" state with coupled polar and spin glass behaviors. This interaction, driven by manganese ions, reveals significant magnetoelectric coupling in the material.

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Area of Science:

Condensed Matter Physics
Materials Science
Solid State Chemistry

Background:

Multiferroic materials exhibit coexisting electric and magnetic orders.
Glassy states in materials present complex dynamics and interactions.
Strontium titanate (SrTiO3) is an incipient ferroelectric host crystal.

Purpose of the Study:

To investigate the "multiglass" scenario in Sr(0.98)Mn(0.02)TiO(3) ceramics.
To understand the origin and interplay of polar and spin glassy states.
To explore the magnetoelectric coupling between these glassy systems.

Main Methods:

Synthesis of Sr(0.98)Mn(0.02)TiO(3) ceramics.
Characterization of structural and magnetic properties.
Analysis of glassy dynamics and memory effects.
Investigation of spin-phonon interactions.

Main Results:

Observation of a "multiglass" state with coexisting polar and spin glass orders.
Identification of Sr-site substituted Mn2+ ions as the origin of both glassy states.
Determination of glass temperatures Tg ≈ 38 K (polar) and Tg ≤ 34 K (spin).
Demonstration that structural freezing triggers spin freezing, with memory effects in both systems.
Evidence of large higher-order magnetoelectric coupling due to strong spin-phonon interaction.

Conclusions:

Sr(0.98)Mn(0.02)TiO(3) exhibits a novel "multiglass" behavior driven by Mn2+ substitution.
The interplay between polar and spin degrees of freedom is mediated by spin-phonon coupling.
This system serves as a model for studying complex magnetoelectric coupling in glassy states.