Anisotropic quasiparticle coherence in nematic BaFe2As2 studied with strain-dependent ARPES

Article

关键词: HIGH-TEMPERATURE SUPERCONDUCTIVITY;    CROSS-SECTIONS;   

DOI  :  10.1103/PhysRevB.103.165136

来源: SCIE

【 摘 要 】

The hallmark of nematic order in iron-based superconductors is a resistivity anisotropy but it is unclear to which extent quasiparticle dispersions, lifetimes, and coherence contribute. While the lifted degeneracy of the Fe d(xz) and d(yz) dispersions has been studied extensively, only little is known about the two other factors. Here, we combine in situ strain tuning with ARPES and study the nematic response of the spectral weight in BaFe2As2. The symmetry analysis of the ARPES spectra demonstrates that the d(xz) band gains quasiparticle spectral weight compared to the d(yz) band for negative antisymmetric strain Delta epsilon(yy) suggesting the same response inside the nematic phase. Our results are compatible with a different coherence of the d(xz) and d(yz) orbital within a Hund's metal picture. We also discuss the influence of orbital mixing.

【 授权许可】

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