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Unusual Superconducting Gap in (Ba,K)Fe2As2 Superconductor | | Lin Zhao
; Haiyun Liu
; Wentao Zhang
; Jianqiao Meng
; Xiaowen Jia
; Guodong Liu
; Xiaoli Dong
; G. F. Chen
; J. L. Luo
; N. L. Wang
; Guiling Wang
; Yong Zhou
; Yong Zhu
; Xiaoyang Wang
; Zhongxian Zhao
; Zuyan Xu
; Chuangtian Chen
; X. J. Zhou
; | | Date: |
2 Jul 2008 | | Abstract: | The recent discovery of superconductivity in iron-based compounds has
generated great interest because they represent second class of high
temperature superconductors after the discovery of the first high temperature
superconductivity in copper-based compounds. It is intriguing to find out
whether the superconductivity mechanism in this new system is conventional, or
parallel to that in cuprates, or is along a new route in realizing high
temperature superconductivity. Information of the superconducting gap, i.e.,
the energy to break the electron pairs (Cooper pairs) that induces
superconductivity, is intimately related to the superconductivity mechanism.
Here we report direct observation of the superconducting gap in an iron-based
(Ba,K)Fe2As2 superconductor from angle-resolved photoemission spectroscopy
(ARPES) measurement. We have found that the superconducting gap in the
iron-based superconductors is complex and unusual. Different superconducting
gaps are observed on different Fermi surface sheets near the Gamma point that
favor s-wave gap symmetry. Signature of pseudogap is revealed for the Fermi
crossings near the M point. These rich and detailed information on the
superconducting gap will provide key insights in understanding the
superconductivity mechanism in these iron-based high temperature
superconductors. | | Source: | arXiv, 0807.0398 | | Services: | Forum | Review | PDF | Favorites | |
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