Chin. Phys. Lett.  2015, Vol. 32 Issue (06): 067401    DOI: 10.1088/0256-307X/32/6/067401
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
Electronic Structure, Irreversibility Line and Magnetoresistance of Cu0.3Bi2Se3 Superconductor
YI He-Mian1, CHEN Chao-Yu1, SUN Xuan1, XIE Zhuo-Jin1, FENG Ya1, LIANG Ai-Ji1, PENG Ying-Ying1, HE Shao-Long1, ZHAO Lin1, LIU Guo-Dong1, DONG Xiao-Li1, ZHANG Jun1, CHEN Chuang-Tian2, XU Zu-Yan2, GU Gen-Da3, ZHOU Xing-Jiang1,4**
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190
2Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190
3Condensed Matter Physics and Materials Sciences Department, Brookhaven National Laboratory, Upton, New York 11973, USA
4Collaborative Innovation Center of Quantum Matter, Beijing 100871
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YI He-Mian, CHEN Chao-Yu, SUN Xuan et al  2015 Chin. Phys. Lett. 32 067401
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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.
Received: 17 May 2015      and accepted by WANG Ya-Yu Published: 30 June 2015
PACS:  74.25.F- (Transport properties)  
  79.60.Bm (Clean metal, semiconductor, and insulator surfaces)  
  74.25.Op (Mixed states, critical fields, and surface sheaths)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/32/6/067401       OR      https://cpl.iphy.ac.cn/Y2015/V32/I06/067401
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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

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