Nuclear Science and Technology Development Center, National Tsing Hua University, Hsinchu 30013, Taiwan.
J Phys Condens Matter. 2010 Feb 24;22(7):076003. doi: 10.1088/0953-8984/22/7/076003. Epub 2010 Jan 29.
Polycrystalline Tb(2)Ru(2)O(7) has been studied using dc susceptibility, specific heat and neutron scattering techniques. The high temperature paramagnetic state is dominated by the single ion character of Tb(3 + ) and very similar to that of the well-studied spin liquid Tb(2)Ti(2)O(7). However, both the Ru(4 + ) and Tb(3 + ) sublattices order, at about 110 K and 3.5 K, respectively. Although the Tb sublattice does not fully order until 3.5 K, it is polarized in the presence of the internal field generated by the Ru(4 + ) sublattice and possesses a significant moment at 7 K. Magnetic entropy measurements suggest that four levels exist in the first 30 K and inelastic neutron scattering investigations revealed two more levels at 10 and 14 meV. As the magnetic sublattices order, the excitations are perturbed from that measured in the paramagnetic state. These data are compared to data for other terbium based and double pyrochlores.
多晶 Tb(2)Ru(2)O(7) 已通过直流磁化率、比热和中子散射技术进行了研究。高温顺磁态主要由 Tb(3+) 的单离子特性主导，与研究充分的自旋液体 Tb(2)Ti(2)O(7) 非常相似。然而，Ru(4+) 和 Tb(3+) 亚晶格都在大约 110 K 和 3.5 K 处有序。尽管 Tb 亚晶格直到 3.5 K 才完全有序，但它在 Ru(4+) 亚晶格产生的内场的作用下被极化，并在 7 K 时具有显著的磁矩。磁熵测量表明，在前 30 K 存在四个能级，而在 10 和 14 meV 处的非弹性中子散射研究揭示了另外两个能级。随着磁亚晶格的有序化，激发态受到了顺磁态测量的干扰。这些数据与其他基于铽的和双钙钛矿的研究数据进行了比较。
