PrFeAsO氧氮化合物的量子磁电阻
Quantm Magnetoresistance of the PrFeAsO oxypnictides
摘要：
本文报道了在磷属元素化合物超导体的母体化合物PrFeAsO中观察到一种不寻常的横向磁电阻（MR）的$B$依赖性。在自旋密度波转变之下，MR是大的、正的并且随着温度的降低而增加。在低温下，MR随$B$线性增加，直至14 T。对于$T$ $\geq$ 40 K，MR与$B$的曲线在低场区域中形成弱曲率，这表明从$B$线性到$B^2$依赖性的交叉，如$B$ $\rightarrow$ 0。$B$线性磁共振起源于狄拉克锥态，并已由Abrikosov提出的量子力学模型解释。
英文摘要：
We report the observation of an unusual $B$ dependence of transverse magnetoresistance (MR) in the PrFeAsO, one of the parent compound of pnictide superconductors. Below the spin density wave transition, MR is large, positive and increases with decreasing temperature. At low temperatures, MR increases linearly with $B$ up to 14 T. For $T$$\geq$40 K, MR vs $B$ curve develops a weak curvature in the low-field region which indicates a crossover from $B$ linear to $B^2$ dependence as $B$$\rightarrow$0. The $B$ linear MR originates from the Dirac cone states and has been explained by the quantum mechanical model proposed by Abrikosov.
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