Electronic Structure, Irreversibility Line and Magnetoresistance of Cu0.3Bi2Se3 Superconductor
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YI He-Mian,
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CHEN Chao-Yu,
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SUN Xuan,
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XIE Zhuo-Jin,
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FENG Ya,
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LIANG Ai-Ji,
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PENG Ying-Ying,
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HE Shao-Long,
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ZHAO Lin,
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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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GU Gen-Da,
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ZHOU Xing-Jiang
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Abstract
CuxBi2Se3 is a superconductor that is a potential candidate for topological superconductors. We report our laser-based angle-resolved photoemission measurement on the electronic structure of the CuxBi2Se3 superconductor, and a detailed magneto-resistance measurement in both normal and superconducting states. We find that the topological surface state of the pristine Bi2Se3 topological insulator remains robust after the Cu-intercalation, while the Dirac cone location moves downward due to electron doping. Detailed measurements on the magnetic field-dependence of the resistance in the superconducting state establishes an irreversibility line and gives a value of the upper critical field at zero temperature of ∼4000 Oe for the Cu0.3Bi2Se3 superconductor with a middle point Tc of 1.9 K. The relation between the upper critical field Hc2 and temperature T is different from the usual scaling relation found in cuprates and in other kinds of superconductors. Small positive magneto-resistance is observed in Cu0.3Bi2Se3 superconductors up to room temperature. These observations provide useful information for further study of this possible candidate for topological superconductors.
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Cite this article:
YI He-Mian, CHEN Chao-Yu, SUN Xuan, XIE Zhuo-Jin, FENG Ya, LIANG Ai-Ji, PENG Ying-Ying, HE Shao-Long, ZHAO Lin, LIU Guo-Dong, DONG Xiao-Li, ZHANG Jun, CHEN Chuang-Tian, XU Zu-Yan, GU Gen-Da, ZHOU Xing-Jiang. Electronic Structure, Irreversibility Line and Magnetoresistance of Cu
0.3Bi
2Se
3 Superconductor[J].
Chin. Phys. Lett., 2015, 32(6): 067401.
DOI: 10.1088/0256-307X/32/6/067401
YI He-Mian, CHEN Chao-Yu, SUN Xuan, XIE Zhuo-Jin, FENG Ya, LIANG Ai-Ji, PENG Ying-Ying, HE Shao-Long, ZHAO Lin, LIU Guo-Dong, DONG Xiao-Li, ZHANG Jun, CHEN Chuang-Tian, XU Zu-Yan, GU Gen-Da, ZHOU Xing-Jiang. Electronic Structure, Irreversibility Line and Magnetoresistance of Cu0.3Bi2Se3 Superconductor[J]. Chin. Phys. Lett., 2015, 32(6): 067401. DOI: 10.1088/0256-307X/32/6/067401
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YI He-Mian, CHEN Chao-Yu, SUN Xuan, XIE Zhuo-Jin, FENG Ya, LIANG Ai-Ji, PENG Ying-Ying, HE Shao-Long, ZHAO Lin, LIU Guo-Dong, DONG Xiao-Li, ZHANG Jun, CHEN Chuang-Tian, XU Zu-Yan, GU Gen-Da, ZHOU Xing-Jiang. Electronic Structure, Irreversibility Line and Magnetoresistance of Cu0.3Bi2Se3 Superconductor[J]. Chin. Phys. Lett., 2015, 32(6): 067401. DOI: 10.1088/0256-307X/32/6/067401
YI He-Mian, CHEN Chao-Yu, SUN Xuan, XIE Zhuo-Jin, FENG Ya, LIANG Ai-Ji, PENG Ying-Ying, HE Shao-Long, ZHAO Lin, LIU Guo-Dong, DONG Xiao-Li, ZHANG Jun, CHEN Chuang-Tian, XU Zu-Yan, GU Gen-Da, ZHOU Xing-Jiang. Electronic Structure, Irreversibility Line and Magnetoresistance of Cu0.3Bi2Se3 Superconductor[J]. Chin. Phys. Lett., 2015, 32(6): 067401. DOI: 10.1088/0256-307X/32/6/067401
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