Antiphase Fermi-surface modulations accompanying displacement excitation in a parent compound of iron-based superconductors
Antiphase Fermi-surface modulations accompanying displacement excitation in a parent compound of iron-based superconductors
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DOI：
10.1103/physrevb.97.121107
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发表时间：
2018-03-13
影响因子：
3.7
通讯作者：
Shin, Shik
中科院分区：
文献类型：
--
作者：
Okazaki, Kozo;Suzuki, Hakuto;Shin, Shik
我们通过时间和角度分辨光电子能谱研究了铁基超导体母体化合物 BaFe2As2 的瞬态电子结构。为了探测整个布里渊区，我们利用极紫外光子，观察了区心空穴费米面（FS）和区角电子费米面（FS）之间反相的A（1g）声子频率的光发射强度振荡。我们将反相行为归因于其中一个带中心孔 FS 中伴随着磷元素高度位移的翘曲，并发现该位移与用 P 代替 As 引起的位移方向相同，其中超导性是由该系统中没有载流子掺杂的结构修改引起的。
We investigate the transient electronic structure of BaFe2As2, a parent compound of iron-based superconductors, by time-and angle-resolved photoemission spectroscopy. In order to probe the entire Brillouin zone, we utilize extreme ultraviolet photons and observe photoemission intensity oscillation with the frequency of the A(1g) phonon which is antiphase between the zone-centered hole Fermi surfaces (FSs) and zone-cornered electron FSs. We attribute the antiphase behavior to the warping in one of the zone-centered hole FSs accompanying the displacement of the pnictogen height and find that this displacement is the same direction as that induced by substitution of P for As, where superconductivity is induced by a structural modification without carrier doping in this system.