Angle-resolved photoemission observation of isotropic superconducting gaps in isovalent Ru-substituted Ba(Fe0.75Ru0.25)2As2
Angle-resolved photoemission observation of isotropic superconducting gaps in isovalent Ru-substituted Ba(Fe0.75Ru0.25)2As2
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DOI：
10.1103/physrevb.87.094513
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发表时间：
2012-11
影响因子：
3.7
通讯作者：
N. Xu;P. Richard;X.-P. Wang;X. Shi;A. Roekeghem;T. Qian;E. Ieki;K. Nakayama;T. Sato;E. Rienks;S. Thirupathaiah;J. Xing;H. Wen;M. Shi;T. Takahashi;H. Ding
中科院分区：
文献类型：
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作者：
N. Xu;P. Richard;X.-P. Wang;X. Shi;A. Roekeghem;T. Qian;E. Ieki;K. Nakayama;T. Sato;E. Rienks;S. Thirupathaiah;J. Xing;H. Wen;M. Shi;T. Takahashi;H. Ding
我们用高能量分辨角分辨光电子能谱方法研究了Ru取代的Ba（Fe_（0.75）Ru_（0.25））（2）As-2（Tc = 15 K）超导带隙的动量依赖关系。尽管费米面有很强的面外翘曲，实验观察到的超导能隙的大小几乎是各向同性的，与面外动量无关。更准确地说，我们分别观察到5.7和4.5 meV的超导间隙的内部和外部的伽玛为中心的孔费米表面口袋，而4.8 meV的间隙记录在M为中心的电子费米表面口袋。我们的结果与J（1）-J（2）模型一致，其中次近邻Fe之间的反铁磁交换作用占主导地位。DOI：10.1103/PhysRevB.87.094513
We used high-energy resolution angle-resolved photoemission spectroscopy to extract the momentum dependence of the superconducting gap of Ru-substituted Ba(Fe0.75Ru0.25)(2)As-2 (T-c = 15 K). Despite a strong out-of-plane warping of the Fermi surface, the magnitude of the superconducting gap observed experimentally is nearly isotropic and independent of the out-of-plane momentum. More precisely, we respectively observed 5.7 and 4.5 meV superconducting gaps on the inner and outer Gamma-centered hole Fermi surface pockets, whereas a 4.8 meV gap is recorded on the M-centered electron Fermi surface pockets. Our results are consistent with the J(1)-J(2) model with a dominant antiferromagnetic exchange interaction between the next-nearest Fe neighbors. DOI: 10.1103/PhysRevB.87.094513