1/3 magnetization plateau and frustrated ferrimagnetism in a sodium iron phosphite
1/3 magnetization plateau and frustrated ferrimagnetism in a sodium iron phosphite
复制标题
亚磷酸铁钠中的 1/3 磁化平台和受抑亚铁磁性
DOI：
10.1103/physrevb.93.134401
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发表时间：
2016
影响因子：
3.7
通讯作者：
A. A. Tsirlin
中科院分区：
文献类型：
--
作者：
A. N. Vasiliev;O. S. Volkova;E. A. Zvereva;E. A. Ovchenkov;I. Munaò;L. Clark;P. Lightfoot;E. L. Vavilova;S. Kamusella;H.-H. Klauss;J. Werner;C. Koo;R. Klingeler;A. A. Tsirlin
通过交流磁化率、脉冲场磁化强度、比热和高频电子自旋共振（HF-ESR）测量，结合穆斯堡尔谱和密度泛函计算，研究了亚磷酸铁钠。结果表明，该化合物在1/3饱和度处呈现出亚铁磁有序，并呈现出一个磁化平台.平台区延伸到，而高于，磁化强度线性增加，直到达到饱和。穆斯堡尔谱揭示了两个磁性不等价的铁网站与2：1的比例。HF-ESR谱与两个亚晶格亚铁磁体一致，并且还精确地指出了弱磁各向异性以及短程自旋顺序。标题化合物的亚铁磁秩序是由一个纯粹的反铁磁交换相互作用的网络稳定。自旋晶格包括与晶体学（10-1）平面重合的层，层内耦合较强，层间耦合较弱。层内和层间耦合都受到阻碍。随后的亚铁磁秩序产生于一个微妙的相互作用的挫折，但不等价的交换耦合。
The sodium iron phosphiteis studied by ac-magnetic susceptibility, pulsed-field magnetization, specific heat, and high-frequency electron spin resonance (HF-ESR) measurements combined with Mössbauer spectroscopy and density-functional calculations. We show that this compound develops ferrimagnetic order belowand reveals a magnetization plateau at 1/3 saturation. The plateau extends to, whereas abovethe magnetization increases linearly until reaching saturation at. The Mössbauer spectroscopy reveals two magnetically nonequivalent iron sites with the 2:1 ratio. The HF-ESR spectra are consistent with a two-sublattice ferrimagnet and additionally pinpoint weak magnetic anisotropy as well as short-range spin order that persists well above. The ferrimagnetic order in the title compound is stabilized by a network of purely antiferromagnetic exchange interactions. The spin lattice comprises layers coinciding with the crystallographic (10-1) planes, with stronger couplingswithin the layers and weaker couplingsbetween the layers. Both intralayer and interlayer couplings are frustrated. The ensuing ferrimagnetic order arises from a subtle interplay of the frustrated but nonequivalent exchange couplings.