论文标题
沮丧的Heisenberg $ J_1-J_2 $型号在Liybo2的拉伸钻石晶格中
Frustrated Heisenberg $J_1-J_2$ model within the stretched diamond lattice of LiYbO2
论文作者
论文摘要
我们研究了Liybo $ _2 $的磁性，其中包含三维挫败，类似钻石的晶格，通过中子散射，磁化和热容量测量值。 liybo $ _2 $的Yb $^{3+} $离子的拉伸钻石网络进入了一个长期不加压的，螺旋状的状态，并带有有序波矢量$ {\ bf {k}} =（0.384，\ pm 0.384，0） 1/3，0）$相位在磁场的应用下。可以在Heisenberg $ j_1-j_2 $ hamiltonian的框架中理解liybo $ _2 $的螺旋磁接地状态，在拉伸的钻石晶格上，螺旋的传播向量由$ j_2/| j_1 | $ j_2/| $ $ j_2/| $。然而，纯的海森贝格模型未能说明两部分晶格的两个位点上的YB矩之间的相对相分化，以及该细节以及中间体，部分无序的，低于1 K的磁状态的存在表明，该材料的经典Heisenberg描述以外的相互作用。
We investigate the magnetic properties of LiYbO$_2$, containing a three-dimensionally frustrated, diamond-like lattice via neutron scattering, magnetization, and heat capacity measurements. The stretched diamond network of Yb$^{3+}$ ions in LiYbO$_2$ enters a long-range incommensurate, helical state with an ordering wave vector ${\bf{k}} = (0.384, \pm 0.384, 0)$ that "locks-in" to a commensurate ${\bf{k}} = (1/3, \pm 1/3, 0)$ phase under the application of a magnetic field. The spiral magnetic ground state of LiYbO$_2$ can be understood in the framework of a Heisenberg $J_1-J_2$ Hamiltonian on a stretched diamond lattice, where the propagation vector of the spiral is uniquely determined by the ratio of $J_2/|J_1|$. The pure Heisenberg model, however, fails to account for the relative phasing between the Yb moments on the two sites of the bipartite lattice, and this detail as well as the presence of an intermediate, partially disordered, magnetic state below 1 K suggests interactions beyond the classical Heisenberg description of this material.
