Suppressed superconductivity in charge-doped Li(Fe1−xCox)As single crystals

S. Aswartham, G. Behr, L. Harnagea, D. Bombor, A. Bachmann, I. V. Morozov, V. B. Zabolotnyy, A. A. Kordyuk, T. K. Kim, D. V. Evtushinsky, S. V. Borisenko, A. U. B. Wolter, C. Hess, S. Wurmehl, and B. Büchner
Phys. Rev. B 84, 054534 – Published 12 August 2011
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  • INTRODUCTION
  • MATERIALS AND METHODS
  • RESULTS AND DISCUSSION
  • SUMMARY AND CONCLUSION
  • ACKNOWLEDGEMENTS
    • References

    Abstract

    Single crystals of the new unconventional superconductor LiFe1−xCoxAs with x= 0, 0.025, 0.05 were grown by a new approach using the self-flux technique. The superconducting transition temperature was found to decrease upon Co doping at the Fe site. Apparently, in LiFeAs this doping scheme suppresses superconductivity, in contrast to the effects of Co doping in other Fe-As compounds, where it suppresses the spin-density wave and establishes superconductivity. Angle-resolved photoemission spectroscopy shows that the bottom of electron-like bands sinks by about 17 meV upon 5% Co doping, which indicates that the chemical substitution of Co for Fe in LiFeAs results in charge doping.

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    • Received 6 May 2011

    DOI:https://doi.org/10.1103/PhysRevB.84.054534

    ©2011 American Physical Society

    Authors & Affiliations

    S. Aswartham1, G. Behr1, L. Harnagea1, D. Bombor1, A. Bachmann1, I. V. Morozov1,2, V. B. Zabolotnyy1, A. A. Kordyuk1, T. K. Kim1, D. V. Evtushinsky1, S. V. Borisenko1, A. U. B. Wolter1, C. Hess1, S. Wurmehl1,*, and B. Büchner1

    • 1Leibniz Institute for Solid State and Materials Research, D-01069 Dresden, Germany
    • 2Department of Chemistry, Moscow State University, Moscow 119991, Russia

    • *s.wurmehl@ifw-dresden.de

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    Vol. 84, Iss. 5 — 1 August 2011

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