Possible nodal superconducting gap emerging at the Lifshitz transition in heavily hole-doped Ba0.1K0.9Fe2As2
Possible nodal superconducting gap emerging at the Lifshitz transition in heavily hole-doped Ba0.1K0.9Fe2As2
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DOI：
10.1103/physrevb.88.220508
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发表时间：
2013-08
影响因子：
3.7
通讯作者：
N. Xu;P. Richard;Xun Shi;A. Roekeghem;T. Qian;E. Razzoli;E. Rienks;G. F. Chen;E. Ieki;K. Nakayama;Takafumi Sato;Takashi Takahashi;M. Shi;Hong Ding
中科院分区：
文献类型：
--
作者：
N. Xu;P. Richard;Xun Shi;A. Roekeghem;T. Qian;E. Razzoli;E. Rienks;G. F. Chen;E. Ieki;K. Nakayama;Takafumi Sato;Takashi Takahashi;M. Shi;Hong Ding
我们对T_c=9K的高掺杂Ba0.1K0.9Fe2As2进行了高能量分辨ARPES研究，这种材料的费米表面拓扑结构类似于KFe2As2，而不同于少量掺杂的Ba0.3K0.7Fe2As2，这意味着在x=0.7和x=0.9之间发生了Lifshitz相变。尽管对于出现在偏离M中心的费米面口袋瓣尖端的垂直节点，超导能隙结构类似于Ba0.3K0.7Fe2As2，这表明配对相互作用不是由费米面拓扑驱动的。
We performed a high energy resolution ARPES investigation of over-doped Ba0.1K0.9Fe2As2 with T_c= 9 K. The Fermi surface topology of this material is similar to that of KFe2As2 and differs from that of slightly less doped Ba0.3K0.7Fe2As2, implying that a Lifshitz transition occurred between x=0.7 and x=0.9. Albeit for a vertical node found at the tip of the emerging off-M-centered Fermi surface pocket lobes, the superconducting gap structure is similar to that of Ba0.3K0.7Fe2As2, suggesting that the paring interaction is not driven by the Fermi surface topology.