论文标题
极性氧化物hocrwo $ _6 $的晶体和磁性结构
Crystal and Magnetic Structure of Polar Oxide HoCrWO$_6$
论文作者
论文摘要
极性磁氧化物hocrwo $ _6 $合成，其晶体结构，磁性结构和热力学特性将被研究。由于w $^{6+} $和cr $^{3+} $，hocrwo $ _6 $形成极性晶体结构（太空组PNA2 $ _1 $（＃33））。 TN = 24.5 k和磁性熵变化（〜5 j.kg。中子衍射测量表明，CR和HO Sublattices均以2.32（5）$μ_b$和8.7（4）$μ_b$分别在2 K时排序。虽然Cr形成沿$ b $轴的磁矩，而cr形成了A型共线抗铁磁（AFM）结构，但在非coplanar afm排列中的ho sublattice订单。与等构结构Dyfewo $ _6 $和Dycrwo $ _6 $的比较表明，该化合物家族的磁性结构受到过渡金属Sublattice中EG电子的存在或不存在的控制。
Polar magnetic oxide HoCrWO$_6$ is synthesized and its crystal structure, magnetic structure, and thermodynamic properties are investigated. HoCrWO$_6$ forms the polar crystal structure (space group Pna2$_1$ (#33)) due to the cation ordering of W$^{6+}$ and Cr$^{3+}$. There is an antiferromagnetic transition at TN = 24.5 K along with the magnetic entropy change (~5 J.Kg.$^{-1}$K$^{-1}$ at 70 kOe). Neutron diffraction measurement indicates that both Cr and Ho sublattices are ordered with the moment of 2.32(5)$μ_B$ and 8.7(4)$μ_B$ at 2 K, respectively. While Cr forms A-type collinear antiferromagnetic (AFM) structure with magnetic moment along the $b$ axis, Ho sublattice orders in a non-coplanar AFM arrangement. A comparison with isostructural DyFeWO$_6$ and DyCrWO$_6$ indicates that the magnetic structure of this family of compounds is controlled by the presence or absence of eg electrons in the transition metal sublattice.
