具有 J$_{eff}$ = 1/2 的完美 kagome 格子反铁磁体：铜矿物 volborthite 和 vesignieite 的 Co$^{2+}$ 类似物
Perfect kagome-lattice antiferromagnets with J$_{eff}$ = 1/2: The Co$^{2+}$-analogs of copper minerals volborthite and vesignieite
AI总结：
本文合成了两种 Co$^{2+}$ kagome 磁体并研究其磁性，发现其基态为 A 型反铁磁序且在低温磁场下发生变磁性转变，由 J$_{eff}$ = 1/2 物理描述，为阐明该物理机制迈出第一步。
摘要：
我们报告了 Co$^{2+}$ kagome 磁体 Co$_3$V$_2$O$_7$(OH)$_2$$\cdot$2H$_2$O 和 BaCo$_3$(VO$_4$)$_2$(OH)$_2$ 的合成、晶体结构和磁性，它们可被视为被广泛研究的量子 kagome 磁体 volborthite Cu$_3$V$_2$O$_7$(OH)$_2$$\cdot$2H$_2$O 和 vesignieite BaCu$_3$(VO$_4$)$_2$(OH)$_2$ 的 Co 类似物。对于每种化合物，基态看似为 A 型反铁磁序。在低温下，施加磁场会引起类似变磁性的转变，该转变表现为反铁磁排列的倾斜磁矩转变为铁磁排列的磁矩。这些基态和场诱导态包含一个由 Dzyaloshinskii-Moriya 相互作用驱动的、垂直于 kagome 平面的倾斜铁磁分量。这些磁性特征可由 J$_{eff}$ = 1/2 物理很好地描述。我们的发现将是阐明在实验和理论上鲜有研究的 J$_{eff}$ = 1/2 kagome 物理的第一步。
英文摘要：
We report the synthesis, crystal structure, and magnetic properties of Co$^{2+}$ kagome magnets Co$_3$V$_2$O$_7$(OH)$_2$$\cdot$2H$_2$O and BaCo$_3$(VO$_4$)$_2$(OH)$_2$, which can be recognized as Co-analogues of the intensively researched quantum kagome magnet volborthite Cu$_3$V$_2$O$_7$(OH)$_2$$\cdot$2H$_2$O and vesignieite BaCu$_3$(VO$_4$)$_2$(OH)$_2$. For each compound, the ground state is seemingly A-type antiferromagnetic order. At low temperatures, applying a magnetic field causes a metamagnetic-like transition described by the transition in which antiferromagnetically-aligned canted moments change to ferromagnetically-aligned ones. These ground and field-induced states include a canted ferromagnetic component perpendicular to the kagome planes favored by Dzyaloshinskii-Moriya interactions. These magnetic properties are well characterized by the J$_{eff}$ = 1/2 physics. Our findings will be the first step toward clarifying the J$_{eff}$ = 1/2 kagome physics, which has been little studied experimentally or theoretically.
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