Open AccessDoping induced band renormalization in 122-type Fe-based superconductor
Author(s) -
Ram Prakash Pandeya,
Sayantan Datta,
Anup Pradhan Sakhya,
Tanusree Saha,
G. De Ninno,
Rajib Mondal,
Paolo Moras,
Matteo Jugovac,
C. Carbone,
A. Thamizhavel,
Kalobaran Maiti
Publication year - 2022
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2164/1/012004
Subject(s) - condensed matter physics , brillouin zone , fermi level , superconductivity , photoemission spectroscopy , doping , angle resolved photoemission spectroscopy , electronic structure , electronic band structure , renormalization , physics , fermi surface , electron , fermi gamma ray space telescope , quasi fermi level , materials science , chemistry , semimetal , band gap , x ray photoelectron spectroscopy , nuclear magnetic resonance , quantum mechanics
We study the electronic structure of a superconducting composition of 122-type Fe-based pnictide material, CaFe 1.9 Co 0.1 As 2 employing high resolution angle resolved photoemission spectroscopy technique. The experimental results exhibit three bands close to Fermi level at Γ-point of the Brillouin zone among which only one band crosses the Fermi level. In the parent compound, CaFe 2 As 2 , all the three bands cross the Fermi level and form three hole pockets. While the destruction of Fermi pockets due to electron doping (Co-substitution dopes electrons into the system) is expected, we observe significant orbital selective band renormalization with respect to the parent compound. It appears that the effect of spin-orbit coupling is stronger in the doped compound.