用$^{125}$ Te核磁共振研究自旋网状晶格Cu $_3$ TeO $_6$中的反常自旋赝能隙行为
Unusual spin pseudogap behavior in the spin web lattice Cu$_3$TeO$_6$ probed by $^{125}$Te nuclear magnetic resonance
摘要：
我们提出了一个$^{125}$ Te核磁共振（NMR）研究的三维自旋网络晶格铜$_3$ TeO $_6$，其中窝藏拓扑磁振子。$^{125}$ Te NMR谱和Knight位移$\mathcal{K}$随温度的变化表明，在$T_\text{S}\sim 40$ K远低于Néel有序化温度$T_\text{N}\sim 61$ K时，$\mathcal{K}$发生了剧烈变化，为磁有序态内的一级结构相变提供了证据。最值得注意的是，自旋-晶格弛豫速率$T_1^{-1}$的温度依赖性解开了自旋带隙类磁激发，其在$T^*\sim 75$ K处急剧开始，该温度远高于$T_\text{N}$。自旋能隙的行为可以通过高能自旋激发的弱色散光学磁振子分支来理解，这些磁振子分支起源于具有低配位数的独特的角共享Cu六边形自旋1/2网络。
英文摘要：
We present a $^{125}$Te nuclear magnetic resonance (NMR) study in the three-dimensional spin web lattice Cu$_3$TeO$_6$, which harbors topological magnons. The $^{125}$Te NMR spectra and the Knight shift $\mathcal{K}$ as a function of temperature show a drastic change at $T_\text{S}\sim 40$ K much lower than the Néel ordering temperature $T_\text{N}\sim 61$ K, providing evidence for the first-order structural phase transition within the magnetically ordered state. Most remarkably, the temperature dependence of the spin-lattice relaxation rate $T_1^{-1}$ unravels spin-gap-like magnetic excitations, which sharply sets in at $T^*\sim 75$ K, the temperature well above $T_\text{N}$. The spin gap behavior may be understood by weakly dispersive optical magnon branches of high-energy spin excitations originating from the unique corner-sharing Cu hexagon spin-1/2 network with low coordination number.
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