Fermi Surface and Band Structure of (Ca,La)FeAs2 Superconductor from Angle-Resolved Photoemission Spectroscopy
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LIU Xu,
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LIU De-Fa,
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ZHAO Lin,
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GUO Qi,
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MU Qing-Ge,
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CHEN Dong-Yun,
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SHEN Bing,
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YI He-Mian,
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HUANG Jian-Wei,
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HE Jun-Feng,
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PENG Ying-Ying,
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LIU Yan,
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HE Shao-Long,
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LIU Guo-Dong,
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DONG Xiao-Li,
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ZHANG Jun,
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CHEN Chuang-Tian,
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XU Zu-Yan,
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REN Zhi-An,
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ZHOU Xing-Jiang
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Abstract
The (Ca,R)FeAs2 (R=La, Pr, etc.) superconductors with a signature of superconductivity transition above 40 K possess a new kind of block layers that consist of zig-zag As chains. We report the electronic structure of the new (Ca,La)FeAs2 superconductor investigated by both band structure calculations and high resolution angle-resolved photoemission spectroscopy measurements. Band structure calculations indicate that there are four hole-like bands around the zone center Γ(0,0) and two electron-like bands near the zone corner M(π, π) in CaFeAs2. In our angle-resolved photoemission measurements on (Ca0.9La0.1)FeAs2, we have observed three hole-like bands around the Γ point and one electron-like Fermi surface near the M(π, π) point. These results provide important information to compare and contrast with the electronic structure of other iron-based compounds in understanding the superconductivity mechanism in the iron-based superconductors.
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Cite this article:
LIU Xu, LIU De-Fa, ZHAO Lin, GUO Qi, MU Qing-Ge, CHEN Dong-Yun, SHEN Bing, YI He-Mian, HUANG Jian-Wei, HE Jun-Feng, PENG Ying-Ying, LIU Yan, HE Shao-Long, LIU Guo-Dong, DONG Xiao-Li, ZHANG Jun, CHEN Chuang-Tian, XU Zu-Yan, REN Zhi-An, ZHOU Xing-Jiang. Fermi Surface and Band Structure of (Ca,La)FeAs
2 Superconductor from Angle-Resolved Photoemission Spectroscopy[J].
Chin. Phys. Lett., 2013, 30(12): 127402.
DOI: 10.1088/0256-307X/30/12/127402
LIU Xu, LIU De-Fa, ZHAO Lin, GUO Qi, MU Qing-Ge, CHEN Dong-Yun, SHEN Bing, YI He-Mian, HUANG Jian-Wei, HE Jun-Feng, PENG Ying-Ying, LIU Yan, HE Shao-Long, LIU Guo-Dong, DONG Xiao-Li, ZHANG Jun, CHEN Chuang-Tian, XU Zu-Yan, REN Zhi-An, ZHOU Xing-Jiang. Fermi Surface and Band Structure of (Ca,La)FeAs2 Superconductor from Angle-Resolved Photoemission Spectroscopy[J]. Chin. Phys. Lett., 2013, 30(12): 127402. DOI: 10.1088/0256-307X/30/12/127402
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LIU Xu, LIU De-Fa, ZHAO Lin, GUO Qi, MU Qing-Ge, CHEN Dong-Yun, SHEN Bing, YI He-Mian, HUANG Jian-Wei, HE Jun-Feng, PENG Ying-Ying, LIU Yan, HE Shao-Long, LIU Guo-Dong, DONG Xiao-Li, ZHANG Jun, CHEN Chuang-Tian, XU Zu-Yan, REN Zhi-An, ZHOU Xing-Jiang. Fermi Surface and Band Structure of (Ca,La)FeAs2 Superconductor from Angle-Resolved Photoemission Spectroscopy[J]. Chin. Phys. Lett., 2013, 30(12): 127402. DOI: 10.1088/0256-307X/30/12/127402
LIU Xu, LIU De-Fa, ZHAO Lin, GUO Qi, MU Qing-Ge, CHEN Dong-Yun, SHEN Bing, YI He-Mian, HUANG Jian-Wei, HE Jun-Feng, PENG Ying-Ying, LIU Yan, HE Shao-Long, LIU Guo-Dong, DONG Xiao-Li, ZHANG Jun, CHEN Chuang-Tian, XU Zu-Yan, REN Zhi-An, ZHOU Xing-Jiang. Fermi Surface and Band Structure of (Ca,La)FeAs2 Superconductor from Angle-Resolved Photoemission Spectroscopy[J]. Chin. Phys. Lett., 2013, 30(12): 127402. DOI: 10.1088/0256-307X/30/12/127402
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