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Title: Complex temperature evolution of the electronic structure of CaFe{sub 2}As{sub 2}

Employing high resolution photoemission spectroscopy, we investigate the temperature evolution of the electronic structure of CaFe{sub 2}As{sub 2}, which is a parent compound of high temperature superconductors—CaFe{sub 2}As{sub 2} exhibits superconductivity under pressure as well as doping of charge carriers. Photoemission results of CaFe{sub 2}As{sub 2} in this study reveal a gradual shift of an energy band, α away from the chemical potential with decreasing temperature in addition to the spin density wave (SDW) transition induced Fermi surface reconstruction across SDW transition temperature. The corresponding hole pocket eventually disappears at lower temperatures, while the hole Fermi surface of the β band possessing finite p orbital character survives till the lowest temperature studied. These results, thus, reveal signature of complex charge redistribution among various energy bands as a function of temperature.
Authors:
; ; ; ; ; ; ;  [1]
  1. Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005 (India)
Publication Date:
OSTI Identifier:
22271179
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 12; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CALCIUM COMPOUNDS; CHARGE CARRIERS; ELECTRONIC STRUCTURE; EMISSION SPECTROSCOPY; FERMI LEVEL; HOLES; IRON ARSENIDES; PHOTOEMISSION; POTENTIALS; PRESSURE DEPENDENCE; SPIN; SUPERCONDUCTIVITY; TEMPERATURE DEPENDENCE; TRANSITION TEMPERATURE