High-resolution angle-resolved photoemission study of BaCo1-xNixS2

T. Sato, H. Kumigashira, D. Ionel, T. Ito, T. Takahashi, I. Hase, H. Ding, J. C. Campuzano, S. Shamoto

Research output: Contribution to journalArticlepeer-review


We have performed angle-resolved photoemission spectroscopy on a layered Mott system BaCo1-x NixS2 across the phase transition from the antiferromagnetic insulator (x = 0.18) to anomalous metal (x = 0.28). In the anomalous metallic phase, we found a large Fermi surface centered at the M(A) point with a dominant Co (Ni) 3d3z2-r2 character. Hubbard bands in the insulating phase have a remnant of Fermi surface in the metallic phase and gradually evolve into metallic dispersive bands upon carrier doping. We conclude that the electronic structure of BaCo1-xNixS2 is basically different from that of the high-Tc cuprates although the transport and magnetic properties share some common features between the two layered compounds.

Original languageEnglish
Pages (from-to)1127-1132
Number of pages6
JournalSurface Review and Letters
Issue number2
Publication statusPublished - 2002 Apr


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