论文标题
在双层kagome材料中抗磁性的强大旋转液态ca $ _ {10} $ cr $ _7 $ o $ $ _ {28} $
Robust spin liquid state against magnetic-dilution in the bi-layer Kagome material Ca$_{10}$Cr$_7$O$_{28}$
论文作者
论文摘要
最近，Bi-Layer Kagome晶格材料CA $ _ {10} $ CR $ _7 $ o $ $ _ {28} $已被证明是一种准二维量子旋转液体（QSL），在这种挫败感中，由于竞争铁磁竞争和抗Ferromagnetic和抗Ferromagagnetic Exchance在内部的挫败感产生了挫败感。为了了解这种平衡受到干扰时会发生什么，我们提出了磁性稀释研究。具体而言，我们已经合成Ca $ _ {10} $（Cr $ _ {1-x} $ v $ _x $）$ _ 7 $ _ 7 $ o $ $ $ _ {28} $（0 $ \ leq $ x $ x $ x $ \ leq $ 0.5） 0 $）。我们还合成了完全非磁性的等值材料ca $ _ {10} $ v $ _7 $ o $ $ $ _ {27.5} $。我们报告了这些材料的详细结构，磁性和热容量研究。对于CA $ _ {10} $（Cr $ _ {1-X} $ v $ _X $）$ _ 7 $ o $ $ $ $ _ {28} $材料的材料增加了$ x $的材料。对于部分V替换样品，发现Curie-Weiss温度从$ 4 $ $ 4 $降低到$ 0.5 $ 〜k的数量级，这表明抗磁磁交换的相对增加，V含量增加。然而，尽管交换相互作用和引入大型疾病的相对平衡发生了这种变化，但在V取代的样品中未观察到磁性顺序或旋转玻璃状态降低至$ 2 $ 〜k。因此，母体化合物的QSL状态似乎在这些大型扰动上似乎很健壮。
Recently, the bi-layer Kagome lattice material Ca$_{10}$Cr$_7$O$_{28}$ has been shown to be a quasi-two-dimensional quantum spin liquid (QSL) where the frustration arises from a balance between competing ferromagnetic and antiferromagnetic exchange within a bi-layer. In an attempt to understand what happens when this balance is disturbed, we present a magnetic dilution study. Specifically, we have synthesized Ca$_{10}$(Cr$_{1-x}$V$_x$)$_7$O$_{28}$ (0 $\leq$ x $\leq$ 0.5) where magnetic Cr$^{5+}$ ($S = 1/2$) is partially replaced by non-magnetic V$^{5+}$ ($S = 0$). We also synthesized the fully non-magnetic isostructural material Ca$_{10}$V$_7$O$_{27.5}$. We report a detailed structural, magnetic and heat capacity study on these materials. A monotonic increase in the unit cell parameters is found for the Ca$_{10}$(Cr$_{1-x}$V$_x$)$_7$O$_{28}$ materials with increasing $x$. An order of magnitude decrease in the Curie-Weiss temperature from $4$ to $0.5$~ K is found for the partial V substituted samples, which indicates a relative increase in antiferromagnetic exchange with increase in V content. However, despite this change in the relative balance in the exchange interactions and the large disorder introduced, no magnetic ordering or spin-glass state is observed down to $2$~K in the V substituted samples. The QSL state of the parent compound thus seems surprisingly robust against these large perturbations.
