Relaxations as key to the magnetocapacitive effects in the perovskite manganites

We present a detailed dielectric study of the relaxation effects that occur in several perovskite rare-earth manganites, including the multiferroics TbMnO(3) and DyMnO(3). We demonstrate that the strong magnetocapacitive effects, observed for electrical fields E parallel c, are nearly completely gov...

Full description

Saved in:
Bibliographic Details
Published in:Physical review letters 2009-05, Vol.102 (20), p.207208-207208, Article 207208
Main Authors: Schrettle, F, Lunkenheimer, P, Hemberger, J, Ivanov, V Yu, Mukhin, A A, Balbashov, A M, Loidl, A
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We present a detailed dielectric study of the relaxation effects that occur in several perovskite rare-earth manganites, including the multiferroics TbMnO(3) and DyMnO(3). We demonstrate that the strong magnetocapacitive effects, observed for electrical fields E parallel c, are nearly completely governed by magnetic-state induced changes of the relaxation parameters. The multiferroic materials, which undergo a transition into a spiral magnetic state, show qualitatively different relaxation behavior than those compounds transferring into an A-type antiferromagnetic state. We ascribe the relaxations in both cases to the off-center motion of the manganese ions, which in the multiferroic systems also leads to the ferroelectric ordering.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.102.207208