Experimental investigation of the suppressed superconducting gap and double-resonance mode in Ba1−xKxFe2As2

Ba1−xKxFe2As2 has an exotic physical property, i.e., the C2 spin-density-wave phase suddenly changes to the C4 magnetic phase, and superconductivity is suppressed within a narrow composition range around x=0.25. We have investigated the doping dependence of the electronic structure of Ba1−xKxFe2As2...

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Bibliographic Details
Published in:Physical review. B 2019-12, Vol.100 (23), p.1
Main Authors: Ideta, S, Murai, N, Nakajima, M, Kajimoto, R, Tanaka, K
Format: Article
Language:English
Subjects:
Electronic structure
Fermi surfaces
Inelastic scattering
Neutron scattering
Neutrons
Photoelectric emission
Resonance scattering
Spin density waves
Superconductivity
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Summary:Ba1−xKxFe2As2 has an exotic physical property, i.e., the C2 spin-density-wave phase suddenly changes to the C4 magnetic phase, and superconductivity is suppressed within a narrow composition range around x=0.25. We have investigated the doping dependence of the electronic structure of Ba1−xKxFe2As2 using angle-resolved photoemission spectroscopy (ARPES), and we found an anomaly in the superconducting (SC) gap structure only for x=0.25 in both the hole and electron Fermi surfaces. We also propose that the mechanism of a newly observed double-resonance peak by inelastic neutron scattering is understandable because of the SC gap obtained by ARPES. Our discovery reveals the important relationship between the C4-magnetic phase and superconductivity, and it provides an opportunity to survey the underlying relationship between the SC gap and the resonance mode in the hole-doped iron-based superconductor.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.100.235135