Neutron Scattering Studies of the spin-5/2 Antiferromagnetic Linear Trimer Substance SrMn_3P_4O_<14>
Neutron Scattering Studies of the spin-5/2 Antiferromagnetic Linear Trimer Substance SrMn_3P_4O_<14>
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自旋5/2反铁磁线性三聚体物质SrMn_3P_4O_<14>的中子散射研究
DOI：
10.1088/1742-6596/340/1/012066
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
et al
中科院分区：
文献类型：
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作者：
M.Hase;A.Donni;K.Ozawa;O.Sakai;V.Pomjakushin;L.Keller;K.Kaneko;et al
利用中子粉末衍射和非弹性中子散射（INS）技术研究了自旋为5/2的反铁磁（AF）线型三聚体SrMn{sub 3}P{sub 4}O{sub 14}。我们确定了T{sub N1} = 2.2（1）K以下的磁结构。有序磁矩具有x和z分量。在1.5 K下，三聚体中两个相邻时刻之间的角度为164或166度符号，表明三聚体内（J{sub 1}）相互作用如预期的是AF。传播向量被表示为k = [0，k{sub y}，0]。在1.5 K时k{sub y}值为0.317，表明存在无公度磁结构。k{sub y}值在1.7 - 1.8 K之间突然变化，在1.8 K以上达到接近0.33的值，表明在T{sub N2} = 1.75（5）K处发生另一相变。我们观察到了多重磁激发。峰位分别为0.46、0.68和1.02 meV。我们的INS结果与三聚体模型中预期的结果一致。我们估计J{sub 1}值为0.29 meV（3.4 K）。
We studied the spin-5/2 antiferromagnetic (AF) linear trimer substance SrMn{sub 3}P{sub 4}O{sub 14} using neutron powder diffraction and inelastic neutron scattering (INS) techniques. We determined the magnetic structure below T{sub N1} = 2.2(1) K. Ordered magnetic moments have x and z components. The angle between two neighboring moments in the trimer is 164 or 166 Degree-Sign at 1.5 K, indicating that the intra-trimer (J{sub 1}) interaction is AF as expected. The propagation vector is expressed as k = [0, k{sub y}, 0]. The value of k{sub y} is 0.317 at 1.5 K, indicating an incommensurate magnetic structure. The value of k{sub y} changes abruptly between 1.7 and 1.8 K and reaches values close to 0.33 above 1.8 K, indicating another phase transition at T{sub N2} = 1.75(5) K. We observed plural magnetic excitations. The peak positions are 0.46, 0.68 and 1.02 meV. Our INS results are consistent with those expected in the trimer model. We evaluated the J{sub 1} value as 0.29 meV (3.4 K).