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arXiv 1606.03040cond-mat.str-elphysics.chem-ph
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一维S = 5/2反铁磁链系统SrMn(VO4)(OH)的结构和磁性表征

Structural and magnetic characterization of the one-dimensional S = 5/2 antiferromagnetic chain system SrMn(VO4)(OH)

Liurukara D. Sanjeewa, V. Ovidiu Garlea, Michael A. McGuire, Colin D. McMillen, Huibo Cao, Joseph W. Kolis

摘要:

采用高温高压水热法合成了钙钛矿型化合物SrMn(VO 4)(OH)的大单晶。X射线单晶结构分析表明,该材料的结晶在P212121的偏心正交空间群。该结构表现出一维的功能,与MnO 4链传播沿a轴的VO 4四面体互连。拉曼光谱和红外光谱,以确定基本的钒酸盐和氢氧化物的振动模式。磁化强度数据显示在80 K附近有一个很宽的最大值,这是由于最近的Mn邻体之间的一维磁相关性,其链内交换常数为J/kB = 9.97(3)K,而在TN = 30 K以下有一个倾斜的反铁磁行为。单晶中子衍射在4 K产生的磁结构的解决方案,在较低的对称性的磁空间群P21与两个独特的链显示反铁磁有序Mn矩取向几乎垂直于链轴。Dzyaloshinskii Moriya反对称交换相互作用的存在导致自旋的轻微倾斜,并产生沿链方向的弱铁磁分量。

英文摘要:

The descloizite-type compound, SrMn(VO4)(OH), was synthesized as large single crystals using a high-temperature high-pressure hydrothermal technique. X-ray single crystal structure analysis reveals that the material crystallizes in the acentric orthorhombic space group of P212121. The structure exhibits a one-dimensional feature, with MnO4 chains propagating along the a-axis which are interconnected by VO4 tetrahedra. Raman and infrared spectra were obtained to identify the fundamental vanadate and hydroxide vibrational modes. Magnetization data reveal a broad maximum at approximately 80 K, arising from one-dimensional magnetic correlations with intrachain exchange constant of J/kB = 9.97(3) K between nearest Mn neighbors and a canted antiferromagnetic behavior below TN = 30 K. Single crystal neutron diffraction at 4 K yielded a magnetic structure solution in the lower symmetry of the magnetic space group P21 with two unique chains displaying antiferromagnetically ordered Mn moments oriented nearly perpendicular to the chain axis. The presence of the Dzyaloshinskii Moriya antisymmetric exchange interaction leads to a slight canting of the spins and gives rise to a weak ferromagnetic component along the chain direction.

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