Na $_x$ CoO PDMATHAAC for $0.71 \leq x \leq 0.84$中的局域矩、巡游和偏离费米液体行为
Local moment, itinerancy and deviation from Fermi liquid behavior in Na$_x$CoO$_2$ for $0.71 \leq x \leq 0.84$
摘要：
在这里，我们报告观察费米面（FS）口袋通过舒布尼科夫德哈斯效应在Na $_x$ CoO $_2$为$x = 0.71$和0.84，分别。我们的观察结果表明，FS预期为每个化合物相交其相应的布里渊区，如先前报道的超晶格结构所定义的，导致小的重建FS口袋，但只有当一个精确的孔数为\emph{localized}每个单元格。对于$0.71 \leq x < 0.75$的巡游载流子和本地化的$S =1/2$自旋在一个顺磁性的三角形超晶格的共存导致在低温下观察到偏离标准的费米液体行为的电输运和热容性质，这表明某种量子自旋液体基态的形成。
英文摘要：
Here we report the observation of Fermi surface (FS) pockets via the Shubnikov de Haas effect in Na$_x$CoO$_2$ for $x = 0.71$ and 0.84, respectively. Our observations indicate that the FS expected for each compound intersects their corresponding Brillouin zones, as defined by the previously reported superlattice structures, leading to small reconstructed FS pockets, but only if a precise number of holes per unit cell is \emph{localized}. For $0.71 \leq x < 0.75$ the coexistence of itinerant carriers and localized $S =1/2$ spins on a paramagnetic triangular superlattice leads at low temperatures to the observation of a deviation from standard Fermi-liquid behavior in the electrical transport and heat capacity properties, suggesting the formation of some kind of quantum spin-liquid ground state.
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