Metallic phase in stoichiometric CeOBiS 2 revealed by space-resolved ARPES

T. Sugimoto, E. Paris, Takanori Wakita, Kensei Terashima, Takayoshi Yokoya, A. Barinov, J. Kajitani, R. Higashinaka, T. D. Matsuda, Y. Aoki, T. Mizokawa, N. L. Saini

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Abstract

Recently CeOBiS 2 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 CeOBiS 2 . 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 BiS 2 -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 CeOBiS 2 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.

Original languageEnglish
Article number20351
JournalScientific Reports
Volume8
Issue number1
DOIs
Publication statusPublished - Dec 1 2018

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Sugimoto, T., Paris, E., Wakita, T., Terashima, K., Yokoya, T., Barinov, A., Kajitani, J., Higashinaka, R., Matsuda, T. D., Aoki, Y., Mizokawa, T., & Saini, N. L. (2018). Metallic phase in stoichiometric CeOBiS 2 revealed by space-resolved ARPES. Scientific Reports, 8(1), [20351]. https://doi.org/10.1038/s41598-018-20351-y