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T. Sato, H. Kumigashira, D. Ionel, Takatoshi Ito (), T. Takahashi, I. Hase, Haiyan Ding, J. C. Campuzano and S. Shamoto
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T. Sato: Department of Physics, Tohoku University, Sendai 980-8578, Japan
H. Kumigashira: Department of Physics, Tohoku University, Sendai 980-8578, Japan
D. Ionel: Department of Physics, Tohoku University, Sendai 980-8578, Japan
T. Takahashi: Department of Physics, Tohoku University, Sendai 980-8578, Japan
I. Hase: Electrotechnical Laboratory, Tsukuba 305-8568, Japan
J. C. Campuzano: Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607, USA;
S. Shamoto: Department of Applied Physics, Tohoku University, Sendai 980-8579, Japan

Surface Review and Letters (SRL), 2002, vol. 09, issue 02, 1127-1132

Abstract: We have performed angle-resolved photoemission spectroscopy on a layered Mott systemBaCo1-xNixS2across 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-r2character. 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 ofBaCo1 - xNixS2is basically different from that of the high-Tccuprates although the transport and magnetic properties share some common features between the two layered compounds.

Date: 2002
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DOI: 10.1142/S0218625X02003627

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