$\rm NaNi_2BiO_6$蜂窝层中的反旋无公度磁序和强量子涨落
Counterroating incommensurate magnetic order and strong quantum fluctuations in the honeycomb layers of $\rm NaNi_2BiO_6$
摘要：
我们报道了蜂窝状反铁磁体$\rm NaNi_2BiO_{5.66}$的磁结构和电子性质。我们发现磁顺序与时刻沿$c$轴的温度低于$T_{c1}=6.3(1)\>{\rm K}$，然后在蜂窝平面$T < T_{c2}=4.8(1)\>{\rm K}$与反向旋转模式和有序波矢量${\bf q}=(\frac{1}{3},\> \frac{1}{3},\> 0.15(1))$。密度泛函理论和电子自旋共振表明，这是一个高自旋镍$^{3+}$磁性附近的高到低的自旋转变。有序波矢、面内磁关联、丢失熵、自旋态和超交换路径都与$\rm NaNi_2BiO_{6-δ}$中键依赖的Kitaev- $Γ$ -Heisenberg交换相互作用一致。
英文摘要：
We report the magnetic structure and electronic properties of the honeycomb antiferromagnet $\rm NaNi_2BiO_{5.66}$. We find magnetic order with moments along the $c$ axis for temperatures below $T_{c1}=6.3(1)\>{\rm K}$ and then in the honeycomb plane for $T < T_{c2}=4.8(1)\>{\rm K}$ with a counterrotating pattern and an ordering wave vector ${\bf q}=(\frac{1}{3},\> \frac{1}{3},\> 0.15(1))$. Density functional theory and electron spin resonance indicate this is high-spin Ni$^{3+}$ magnetism near a high to low spin transition. The ordering wave vector, in-plane magnetic correlations, missing entropy, spin state, and superexchange pathways are all consistent with bond-dependent Kitaev-$Γ$-Heisenberg exchange interactions in $\rm NaNi_2BiO_{6-δ}$.
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