La（Fe，Ru）AsO中的磁输运作为能带结构和迁移率的探针
Magnetotransport in La(Fe,Ru)AsO as a probe of band structure and mobility
摘要：
本文研究了Ru取代LaFeAsO化合物在不同温度、磁场和Ru含量下的磁输运行为及其与能带结构的关系。特别是对LaFe_（1-x）Ru_xAsO的磁电阻进行了分析（0 <= x <= 0.6）样品的计算结果表明：在整个系列中：（i）输运主要由电子带决定，（ii）磁电阻具有与Dirac锥有关的独特性质，（iii）磁电阻的性质与Dirac锥的存在有关，（iv）磁电阻的性质与Dirac锥有关。实际上，从头计算证实了在能带结构中各向异性狄拉克锥的存在;（iii）低温迁移率非常高，在T=2K时，在无Ru样品中达到18.6m2/（Vs），（4）在10 K-15 K以上，迁移率突然下降，（5）无序对能带迁移率和输运性质的影响很小;（vi）Dirac锥的温度范围与SDW载流子凝聚之间存在着相关性。这些发现对于研究与这一系列母体化合物有关的F掺杂超导La（Fe，Ru）As（O，F）化合物的配对机制具有重要意义。
英文摘要：
In this work we investigate the Ru substituted LaFeAsO compound, by studying the magnetotransport behaviour and its relationship with the band structure, in different regimes of temperature, magnetic field and Ru content. In particular we analyse the magnetoresistance of LaFe1-xRuxAsO (0 <= x <= 0.6) samples with the support of ab initio calculations and we find out that in the whole series: (i) the transport is dominated by electron bands only; (ii) the magnetoresistance exhibits distinctive features related to the presence of Dirac cones; indeed, ab initio calculations confirm the presence of anisotropic Dirac cones in the band structure; (iii) the low temperature mobility is exceptionally high and reaches 18.6 m2/(Vs) in the Ru-free sample at T=2K, in the extreme limit of a single Landau level occupied in the Dirac cones; (iv) the mobility drops abruptly above 10K-15K; (v) the disorder has a very weak effect on the band mobilities and on the transport properties; (vi) there exists a correlation between the temperature ranges of Dirac cones and SDW carrier condensation. These findings may be of crucial importance in the investigation of the pairing mechanism in the F-doped superconducting La(Fe,Ru)As(O,F) compounds related to this series of parent compounds.
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