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首页> 外文期刊>Physica, C. Superconductivity and its applications >Electronic properties of iron arsenic high temperature superconductors revealed by angle resolved photoemission spectroscopy (ARPES)
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Electronic properties of iron arsenic high temperature superconductors revealed by angle resolved photoemission spectroscopy (ARPES)

机译：角分辨光发射光谱法（ARPES）揭示了铁砷高温超导体的电子性能

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摘要

We present an overview of the electronic properties of iron arsenic high temperature superconductors with emphasis on low energy band dispersion, Fermi surface and superconducting gap. ARPES data is compared with full-potential linearized plane wave (FLAPW) calculations. We focus on single layer NdFeAs0.9F0.1 (R11111) and two layer Ba1-x(,Fe2As2 (B1122) compounds. We find general similarities between experimental data and Calculations in terms of character of Fermi Surface pockets, and overall band dispersion. We also find a number of differences in details of the shape and size of the Fermi surfaces as well as the exact energy location of the bands, which indicate that magnetic interaction and ordering significantly affects the electronic properties of these materials. The Fermi surface consists of several hole pockets centered at Gamma and electron pockets located in zone corners. The size and shape of the Fermi surface changes significantly with doping. Emergence of a coherent peak below the critical temperature T-c and diminished spectral weight at the chemical potential above T-c closely resembles the spectral characteristics of the cuprates, however the nodeless superconducting gap clearly excludes the possibility of d-wave order parameter. Instead it points to s-wave or extended s-wave symmetry of the order parameter. (C) 2009 Elsevier B.V. All rights reserved.
机译：我们对铁砷高温超导体的电子性能进行了概述，重点是低能带分散，费米表面和超导间隙。将ARPES数据与全电位线性化平面波（FLAPW）计算进行比较。我们着眼于单层NdFeAs0.9F0.1（R11111）和两层Ba1-x（，Fe2As2（B1122）化合物，我们发现实验数据和计算之间在费米表面凹穴的特征和整个谱带色散方面普遍相似。我们在费米表面的形状和尺寸以及能带的确切能量位置的细节上也发现了许多差异，这表明磁相互作用和有序性会显着影响这些材料的电子性能。几个以Gamma为中心的空穴穴和位于区域角的电子穴。费米表面的尺寸和形状随掺杂而显着变化。在临界温度Tc以下出现了一个相干峰，在Tc以上的化学势上谱重减小了，这很像。铜酸盐的光谱特性，但是无节点超导间隙显然排除了d波阶参数的可能性。而且它指向阶次参数的s波对称性或扩展的s波对称性。 （C）2009 Elsevier B.V.保留所有权利。

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