“…2). It should be mentioned that no rigid shift has been found in photoemission studies on CeOBiS 2 system as a function of charge doping induced by F-substitution in place of O 26 . Here, the average shift between different features in Figs 2 and 3 is ∼0.1–0.2 eV, consistent with earlier study on the same system.Figure 3Fermi surfaces for metallic phase at A-point ( a ) and those for semiconducting phase at B-point ( b ) (A- and B-points are indicated in Fig.…”
Recently CeOBiS2 system without any fluorine doping is found to show superconductivity posing question on its origin. Using space resolved ARPES we have found a metallic phase embedded in the morphological defects and at the sample edges of stoichiometric CeOBiS2. While bulk of the sample is semiconducting, the embedded metallic phase is characterized by the usual electron pocket at X point, similar to the Fermi surface of doped BiS2-based superconductors. Typical size of the observed metallic domain is larger than the superconducting correlation length of the system suggesting that the observed superconductivity in undoped CeOBiS2 might be due to this embedded metallic phase at the defects. The results also suggest a possible way to develop new systems by manipulation of the defects in these chalcogenides with structural instability.
“…2). It should be mentioned that no rigid shift has been found in photoemission studies on CeOBiS 2 system as a function of charge doping induced by F-substitution in place of O 26 . Here, the average shift between different features in Figs 2 and 3 is ∼0.1–0.2 eV, consistent with earlier study on the same system.Figure 3Fermi surfaces for metallic phase at A-point ( a ) and those for semiconducting phase at B-point ( b ) (A- and B-points are indicated in Fig.…”
Recently CeOBiS2 system without any fluorine doping is found to show superconductivity posing question on its origin. Using space resolved ARPES we have found a metallic phase embedded in the morphological defects and at the sample edges of stoichiometric CeOBiS2. While bulk of the sample is semiconducting, the embedded metallic phase is characterized by the usual electron pocket at X point, similar to the Fermi surface of doped BiS2-based superconductors. Typical size of the observed metallic domain is larger than the superconducting correlation length of the system suggesting that the observed superconductivity in undoped CeOBiS2 might be due to this embedded metallic phase at the defects. The results also suggest a possible way to develop new systems by manipulation of the defects in these chalcogenides with structural instability.
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