铕铌氧氮化物（EuNbO₂N）中的大耦合磁阻响应。

Large coupled magnetoresponses in EuNbO2N.

作者信息

Jorge A Belén, Oró-Solé Judith, Bea Ana M, Mufti Nandang, Palstra Thomas T M, Rodgers Jennifer A, Attfield J Paul, Fuertes Amparo

机构信息

Institut de Ciència de Materials de Barcelona (C.S.I.C.), Campus U.A.B., 08193 Bellaterra, Spain.

出版信息

J Am Chem Soc. 2008 Sep 24;130(38):12572-3. doi: 10.1021/ja804139g. Epub 2008 Aug 29.

DOI:10.1021/ja804139g

PMID:18759396

Abstract

We have explored a new strategy to discover materials with large resistive or capacitive responses to magnetic fields by synthesizing EuMO2N (M = Nb, Ta) perovskites that combine ferromagnetic order of S = 7/2 Eu2+ spins with possible off-center distortions of the d0 M5+ cations enhanced by covalent bonding to N. EuNbO2N shows colossal magnetoresistances at low temperatures and a giant magnetocapacitance. However, the latter response originates from a microstructural effect rather than an intrinsic multiferroism.

摘要

我们探索了一种新策略，通过合成EuMO2N（M = Nb，Ta）钙钛矿来发现对磁场具有大电阻或电容响应的材料，该钙钛矿将S = 7/2 Eu2+自旋的铁磁有序与d0 M5+阳离子可能的偏离中心畸变相结合，这种畸变通过与N的共价键增强。EuNbO2N在低温下表现出巨大磁电阻和巨磁电容。然而，后者的响应源自微观结构效应而非本征多铁性。