Published October 27, 2014 | Version v1
Journal article Metadata-only

Observation of an electron band above the Fermi level in FeTe0.55Se0.45 from in-situ surface doping

Creators

  • 1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)
  • 2. Collaborative Innovation Center of Quantum Matter, Beijing (China)
  • 3. Paul Scherrer Institut, Swiss Light Source, CH-5232 Villigen PSI (Switzerland)
  • 4. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
  • 5. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
  • 6. Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)

Description

We used in-situ potassium (K) evaporation to dope the surface of the iron-based superconductor FeTe0.55Se0.45. 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 KFe2−xSe2 compound.

Additional details

Identifiers

DOI
10.1063/1.4900870;
arXiv
arXiv:1409.8383v2;

Publishing Information

Journal Title
Applied Physics Letters
Journal Volume
105
Journal Issue
17
Journal Page Range
p. 172601-172601.4
ISSN
0003-6951
CODEN
APPLAB

INIS

Country of Publication
United States
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
46016836
Subject category
S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
Descriptors DEI
DOPED MATERIALS; ELECTRONS; EVAPORATION; FERMI LEVEL; IRON COMPOUNDS; POTASSIUM; SELENIUM COMPOUNDS; SUPERCONDUCTORS; SURFACES; TELLURIUM COMPOUNDS; THREE-DIMENSIONAL CALCULATIONS
Descriptors DEC
ALKALI METALS; ELEMENTARY PARTICLES; ELEMENTS; ENERGY LEVELS; FERMIONS; LEPTONS; MATERIALS; METALS; PHASE TRANSFORMATIONS; TRANSITION ELEMENT COMPOUNDS

Optional Information

Notes
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