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Structure and magnetic properties of the Ho_2Ge_2O_7 pyrogermanate

机译:Ho_2Ge_2O_7锗锰酸盐的结构和磁性

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We report the anisotropic magnetic properties of Ho_2Ge_2O_7 determined from dc and ac magnetization, specific heat and powder neutron-diffraction experiments. The magnetic lanthanide sublattice, seen in our refinement of the tetragonal pyrogermanate crystal structure, is a right-handed spiral of edge-sharing and corner-sharing triangles; the local Ho-O coordination indicates that the crystal field is anisotropic. Susceptibility and magnetization data indeed show that the magnetism is highly anisotropic, and the magnetic structure has the Ho moments confined to the plane perpendicular to the structural spiral. The ordered moment of Ho~(3+), as determined from refinement of the neutron-diffraction data, is 9.0 μ_B. Magnetic ordering occurs around 1.6 K. Temperature and field dependent ac susceptibility measurements show that this compound displays spin relaxation phenomena analogous to what is seen in the spin ice pyrochlore system Ho_2Ti_2O_7.
机译:我们报告了由直流和交流磁化,比热和粉末中子衍射实验确定的Ho_2Ge_2O_7的各向异性磁性能。从我们对四角铁锗酸盐晶体结构的细化中可以看出,磁性镧系元素亚晶格是边共享三角形和边共享三角形的右旋螺旋。局部Ho-O配位表明晶体场是各向异性的。磁化率和磁化数据确实表明,磁是高度各向异性的,并且磁结构的Ho矩被限制在垂直于结构螺旋的平面上。根据对中子衍射数据的细化确定,Ho〜(3+)的有序矩为9.0μB。磁序在1.6 K左右发生。与温度和场相关的磁化率测量表明,该化合物显示的自旋弛豫现象类似于在自旋冰烧绿石体系Ho_2Ti_2O_7中看到的现象。

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