Colossal magnetodielectric effects in DyMn2O5 -: art. no. 107207
Colossal magnetodielectric effects in DyMn2O5 -: art. no. 107207
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DOI：
10.1103/physrevlett.93.107207
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发表时间：
2004-09-03
影响因子：
8.6
通讯作者：
Cheong, SW
中科院分区：
文献类型：
--
作者：
Hur, N;Park, S;Cheong, SW
我们已经研究了详细的磁场依赖性的电极化和介电常数在（Tb，Dy，Ho）Mn 2 O 5的磁性和铁电性转变密切耦合。我们的基本发现是介电常数随磁场的变化前所未有的大，特别是在DyMn_2 O_5中，与不寻常的磁化率-无公度磁转变相关。这种不寻常的效果似乎起源于无公度态对外部微扰的高度敏感性。
We have investigated the detailed magnetic field dependence of the electric polarization and dielectric constant in (Tb,Dy,Ho)Mn2O5 where magnetic and ferroelectric transitions are intimately coupled. Our fundamental discovery is the unprecedented large change of the dielectric constant with magnetic field, particularly in DyMn2O5, associated with an unusual commensurate-incommensurate magnetic transition. This extraordinary effect appears to originate from the high sensitivity of the incommensurate state to external perturbation.