波纹正方形网状化合物Cu $_3$（TeO PDMATHAAC）（SO $_4$）$\cdot$ H $_2$ O的反铁磁有序和自旋倾斜转变
Antiferromagnetic Order and Spin-Canting Transition in the Corrugated Square Net Compound Cu$_3$(TeO$_4$)(SO$_4$)$\cdot$H$_2$O
摘要：
层状钙钛矿结构中的强关联电子是高温超导性、自旋液体和量子临界性的发源地。具体地，具有由角共享正方形平面CuO $_4$单元制成的层状结构的铜酸盐材料由于其Mott绝缘基态而被深入研究，这导致掺杂后的高温超导性。识别具有相似晶格和电子结构的新化合物已成为固态化学中的一个挑战。在这里，我们报告了一个新的碲酸铜硫酸盐Cu $_3$（TeO $_4$）（SO $_4$）$\cdot$ H $_2$ O，一个有前途的替代层状钙钛矿的水热晶体生长。正交相（空间群$Pnma$）由与TeO $_4$单元边缘共享的角共享CuO $_4$方形平面单元的波纹层制成。这些层通过共用角的CuO $_4$和SO $_4$的板连接。使用键价和分析和磁化数据，我们发现纯铜$^{2+}$离子内的层，但混合价的铜$^{2+}$ /铜${^+}$层之间。Cu $_3$（TeO $_4$）（SO $_4$）$\cdot$ H $_2$ O在$T_N$ =67 K时发生反铁磁转变，磁化率出现峰值.在进一步冷却时，在$T^{\star}$ =12 K时发生自旋倾斜转变，这由热容中的扭结证明。基于磁相互作用的$J_1$-$J_2$模型解释了自旋倾斜转变，这与略有不同的面内超交换路径一致。我们提出Cu $_3$（TeO $_4$）（SO $_4$）$\cdot$ H $_2$ O作为未来掺杂和应变实验的有前途的平台，可以将Mott绝缘基态调谐到超导或自旋液体状态。
英文摘要：
Strongly correlated electrons in layered perovskite structures have been the birthplace of high-temperature superconductivity, spin liquid, and quantum criticality. Specifically, the cuprate materials with layered structures made of corner sharing square planar CuO$_4$ units have been intensely studied due to their Mott insulating grounds state which leads to high-temperature superconductivity upon doping. Identifying new compounds with similar lattice and electronic structures has become a challenge in solid state chemistry. Here, we report the hydrothermal crystal growth of a new copper tellurite sulfate Cu$_3$(TeO$_4$)(SO$_4$)$\cdot$H$_2$O, a promising alternative to layered perovskites. The orthorhombic phase (space group $Pnma$) is made of corrugated layers of corner-sharing CuO$_4$ square-planar units that are edge-shared with TeO$_4$ units. The layers are linked by slabs of corner-sharing CuO$_4$ and SO$_4$. Using both the bond valence sum analysis and magnetization data, we find purely Cu$^{2+}$ ions within the layers, but a mixed valence of Cu$^{2+}$/Cu${^+}$ between the layers. Cu$_3$(TeO$_4$)(SO$_4$)$\cdot$H$_2$O undergoes an antiferromagnetic transition at $T_N$=67 K marked by a peak in the magnetic susceptibility. Upon further cooling, a spin-canting transition occurs at $T^{\star}$=12 K evidenced by a kink in the heat capacity. The spin-canting transition is explained based on a $J_1$-$J_2$ model of magnetic interactions, which is consistent with the slightly different in-plane super-exchange paths. We present Cu$_3$(TeO$_4$)(SO$_4$)$\cdot$H$_2$O as a promising platform for the future doping and strain experiments that could tune the Mott insulating ground state into superconducting or spin liquid states.
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