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Quasiparticle interference in antiferromagnetic parent compounds of Fe-based superconductors

机译:准反应在反铁磁母体中的干扰   铁基超导体

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摘要

Recently reported quasiparticle interference imaging in underdopedCa(Fe{1-x}Co{x})_2As{2} shows pronounced C{2} asymmetry that is interpreted asan indication of an electronic nematic phase with a unidirectional electronband, dispersive predominantly along the $b$-axis of this orthorhombicmaterial. On the other hand, even more recent transport measurements onuntwinned samples show near isotropy of the resistivity in the $ab$ plane, withslightly larger conductivity along a (and not b). We show that in fact bothsets of data are consistent with the calculated ab initio Fermi surfaces, whichhas a decisively broken C_{4}, and yet similar Fermi velocity in bothdirections. This reconciles completely the apparent contradiction between theconclusions of the STM and the transport experiments.
机译:最近报道的在掺杂不足的Ca(Fe {1-x} Co {x})_ 2As {2}中的准粒子干涉成像显示出明显的C {2}不对称性,该不对称性被解释为具有单向电子带的电子向列相的指示,主要沿$分散b $-正交材料的轴。另一方面,即使是较新的未包裹样品的输运测量也显示出在ab $平面内电阻率接近各向同性,沿a(而不是b)的电导率略大。我们表明,实际上两组数据都与计算的从头算起的费米表面一致,该表面具有决定性的C_ {4},但在两个方向上都具有相似的费米速度。这完全解决了STM的结论与运输实验之间的明显矛盾。

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