CEA, Centre de Saclay, DSM/IRAMIS/Laboratoire L´eon Brillouin, F-91191 Gif-sur-Yvette, France.
J Phys Condens Matter. 2011 Apr 27;23(16):164221. doi: 10.1088/0953-8984/23/16/164221. Epub 2011 Apr 6.
We studied the field-induced magnetic structures of Ho(2)Ti(2)O(7) spin ice by means of single-crystal neutron diffraction with a magnetic field applied along a [110] direction. These structures are compared to those of the spin liquid Tb(2)Ti(2)O(7) previously measured in similar experimental conditions. For both compounds, magnetic structures of two types with k = 0 and k = (0, 0, 1) propagation vectors coexist at low temperature (1.6 K) and high applied field (7 T). The k = 0 structures are described by the basis functions of the same irreducible representation for both Tb(2)Ti(2)O(7) and Ho(2)Ti(2)O(7). On the other hand, the k = (0, 0, 1) structures of Tb(2)Ti(2)O(7) and Ho(2)Ti(2)O(7) correspond to different irreducible representations, leading to different magnetic structures.
我们通过单晶中子衍射研究了沿[110]方向施加磁场时 Ho(2)Ti(2)O(7)自旋冰的场致磁结构。这些结构与之前在类似实验条件下测量的自旋液体 Tb(2)Ti(2)O(7)的结构进行了比较。对于这两种化合物，在低温（1.6 K）和高施加场（7 T）下，两种具有 k = 0 和 k = (0, 0, 1) 传播矢量的磁结构共存。k = 0 结构由 Tb(2)Ti(2)O(7)和 Ho(2)Ti(2)O(7)相同不可约表示的基函数描述。另一方面，Tb(2)Ti(2)O(7)和 Ho(2)Ti(2)O(7)的 k = (0, 0, 1) 结构对应于不同的不可约表示，导致不同的磁结构。
