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American Physical Society, Physical review B, 4(92), 2015

DOI: 10.1103/physrevb.92.041113

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Fermi surfaces and orbital polarization in superconductingCeO0.5F0.5BiS2revealed by angle-resolved photoemission spectroscopy

Journal article published in 2015 by T. Sugimoto, D. Ootsuki, C. Morice, E. Artacho, S. S. Saxena, E. F. Schwier ORCID, M. Zheng, Y. Kojima, H. Iwasawa, K. Shimada, M. Arita, H. Namatame, M. Taniguchi, M. Takahashi, N. L. Saini and other authors.
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This paper is available in a repository.

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Abstract

We have investigated the electronic structure of BiS2-based CeO0.5F0.5BiS2 superconductor using polarizationdependent angle-resolved photoemission spectroscopy (ARPES), and succeeded in elucidating the orbital characters on the Fermi surfaces. In the rectangular Fermi pockets around the X point, the straight portion parallel to the ky direction is dominated by Bi 6px character. The orbital polarization indicates the underlying quasi-one-dimensional electronic structure of the BiS2 system. Moreover, distortions on tetragonally aligned Bi could give rise to the band Jahn-Teller effect.