Observation of an electron band above the Fermi level in FeTe{sub 0.55}Se{sub 0.45} from in-situ surface doping

Journal Article · Mon Oct 27 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4900870· OSTI ID:22310663

Zhang, P.; Ma, J.; Qian, T. ^[1]; Xu, N. ^[1]; Xu, Y. -M. ^[2]; Fedorov, A. V.; Denlinger, J. D. ^[3]; Gu, G. D. ^[4]

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1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)
2. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
3. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
4. Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)

We used in-situ potassium (K) evaporation to dope the surface of the iron-based superconductor FeTe{sub 0.55}Se{sub 0.45}. The systematic study of the bands near the Fermi level confirms that electrons are doped into the system, allowing us to tune the Fermi level of this material and to access otherwise unoccupied electronic states. In particular, we observe an electron band located above the Fermi level before doping that shares similarities with a small three-dimensional pocket observed in the cousin, heavily electron-doped KFe{sub 2−x}Se{sub 2} compound.

• OSTI ID: 22310663
• Journal Information: Applied Physics Letters, Vol. 105, Issue 17; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DOPED MATERIALS
ELECTRONS
EVAPORATION
FERMI LEVEL
IRON COMPOUNDS
POTASSIUM
SELENIUM COMPOUNDS
SUPERCONDUCTORS
SURFACES
TELLURIUM COMPOUNDS
THREE-DIMENSIONAL CALCULATIONS