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Magnetic interactions in frustrated Mn3Fe4(VO4)(6)

机译:失意的Mn3Fe4(VO4)(6)中的磁相互作用

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摘要

Magnetic interactions in a site-disordered multicomponent vanadate Mn3Fe4(VO4)(6) are studied using DC magnetization and multifirequency Electron Paramagnetic Resonance (EPR). The static magnetic susceptibility chi shows antiferromagnetic interactions between Fe3+ and Mn2+ spins with a Curie-Weiss temperature Theta = - 165(5) K. EPR measurements indicate a strong dependence of chi on the frequency and temperature. The EPR spectra due to iron and manganese ions are observed in the X-band. It is mostly manganese ions that are observed at 80 GHz while two kinds of magnetic centers are identified at frequencies above 160 GHz. The observed shifts of the resonance lines for Fe3+ ions at low frequencies differ from those at high frequencies. The observed features may be due to different magnetic sublattices which modify the magnetic ground state, while competing magnetic interactions may lead to magnetic frustration. it appears that the very high magnetic fields employed in our high-frequency EPR measurements may affect the spin-flop transitions anticipated below Neel temperature T-N. (C) 2009 Elsevier B.V. All rights reserved.
机译:使用直流磁化和多频电子顺磁共振(EPR)研究了无序多组分钒酸盐Mn3Fe4(VO4)(6)中的磁性相互作用。静态磁化率chi显示居里-魏斯温度Theta =-165(5)K时Fe3 +和Mn2 +自旋之间的反铁磁相互作用。EPR测量表明chi对频率和温度的依赖性很大。在X波段观察到由铁和锰离子引起的EPR光谱。在80 GHz处观察到的大部分是锰离子,而在160 GHz以上的频率处发现了两种磁性中心。 Fe3 +离子在低频下观察到的共振线位移与高频下观察到的位移不同。观察到的特征可能是由于不同的磁性子晶格会改变磁性基态,而竞争性的磁性相互作用可能会导致磁性受挫。看来,在我们的高频EPR测量中采用的非常高的磁场可能会影响预期在Neel温度T-N以下的自旋跃迁跃迁。 (C)2009 Elsevier B.V.保留所有权利。

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