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Magnetic properties of geometrically frustrated SrGd_2O_4

机译：几何受阻的SrGd_2O_4的磁性

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A study of the magnetic properties of the frustrated rare-earth oxide SrGd_2O_4 has been completed using bulk property measurements of magnetization, susceptibility, and specific heat on single-crystal samples. Two zero-field phase transitions have been identified at 2.73 and 0.48 K. For the field H, applied along the a and b axes, a single boundary is identified that delineates the transition from a low-field, low-temperature magnetically ordered regime to a high-field, high-temperature paramagnetic phase. Several field-induced transitions, however, have been observed with H ‖c. The measurements have been used to map out the magnetic phase diagram of SrGd_2O_4, suggesting that it is a complex system with several competing magnetic interactions. The low-temperature magnetic behavior of SrGd_2O_4 is very different compared to the other SrL_2O_4 (L = Lanthanide) compounds studied so far, even though all of the SrL_2O_4 compounds are isostructural, with the magnetic ions forming a low-dimensional lattice of zigzag chains that run along the c axis. The differences are likely to be due to the fact that in the ground state Gd~(3+) has zero orbital angular momentum and therefore the spin-orbit interactions, which are crucial for other SrL_2O_4 compounds, can largely be neglected. Instead, given the relatively short Gd~(3+)-Gd~(3+) distances in SrGd_2O_4, dipolar interactions must be taken into account for this antiferromagnet alongside the Heisenberg exchange terms.
机译：沮丧的稀土氧化物SrGd_2O_4的磁性能研究已经完成，使用了单晶样品的磁化，磁化率和比热的整体性能测量。在2.73和0.48 K处确定了两个零场相变。对于沿a和b轴施加的磁场H，确定了一个边界，该边界描绘了从低场，低温磁有序态到高场高温顺磁相。但是，在H‖c处观察到了几个场致的跃迁。这些测量已用于绘制SrGd_2O_4的磁相图，表明它是一个具有多个竞争性磁相互作用的复杂系统。与迄今为止研究的其他SrL_2O_4（L =镧系元素）化合物相比，SrGd_2O_4的低温磁行为有很大不同，即使所有SrL_2O_4化合物都是同构的，其中的磁性离子形成了Z型曲折链的低维晶格，沿c轴运行。差异可能是由于在基态Gd〜（3+）的轨道角动量为零，因此对于其他SrL_2O_4化合物至关重要的自旋-轨道相互作用可以忽略不计。相反，鉴于SrGd_2O_4中Gd〜（3 +）-Gd〜（3+）的距离相对较短，该反铁磁体必须与Heisenberg交换项一起考虑偶极相互作用。

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