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arXiv 1102.3125cond-mat.str-el
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三角点阵α- SrCr2O4的螺旋磁性和结构异常

Helical magnetism and structural anomalies in triangular lattice α-SrCr2O4

S E Dutton, E Climent-Pascual, P W Stephens, J P Hodges, A Huq, C L Broholm, R J Cava

摘要:

α-SrCr_2O_4是由CrO_6八面体组成的d_3Cr_3+三角形平面晶格,平面与六方对称相比有很小的正交畸变。Weiss温度为-596 K,三维磁有序温度为43 K,磁系统是准二维的和挫折。中子粉末衍射表明,有序态为无公度螺旋磁体,面内传播矢量k =(0,0.3217(8),0).温度相关的同步辐射粉末衍射表征的结构显示在低于100 K的冷却和在磁有序温度的细胞参数的拐点的平面间间距的增加。这些异常表明存在中等程度的磁结构耦合。

英文摘要:

α-SrCr2O4 has a triangular planar lattice of d3 Cr3+ made from edge sharing CrO6 octahedra; the plane shows a very small orthorhombic distortion from hexagonal symmetry. With a Weiss temperature of -596 K and a three-dimensional magnetic ordering temperature of 43 K, the magnetic system is quasi two-dimensional and frustrated. Neutron powder diffraction shows that the ordered state is an incommensurate helical magnet, with an in-plane propagation vector of k = (0,0.3217(8),0). Temperature dependent synchrotron powder diffraction characterization of the structure shows an increase in the inter-plane spacing on cooling below 100 K and an inflection in the cell parameters at the magnetic ordering temperature. These anomalies indicate the presence of a moderate degree of magneto-structural coupling.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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