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Published March 16, 2007 | Published
Journal Article Open

Emergence of Fermi Pockets in a New Excitonic Charge-Density-Wave Melted Superconductor

Abstract

A superconducting state (T_c∼4.2  K) has very recently been observed upon successful doping of the charge-density-wave (CDW) ordered triangular lattice TiSe_2, with copper. Using state-of-the-art photoemission spectroscopy we identify, for the first time, momentum-space locations of doped electrons that form the Fermi sea of the superconductor. With doping, we find that kinematic nesting volume increases, whereas coherence of the CDW collective order sharply drops. In superconducting doping, as chemical potential rises, we observe the emergence of a large density of states in the form of a narrow electron pocket near the L point of the Brillouin zone with d-like character. The k-space spectral evolution directly demonstrates, for the first time, that the CDW order parameter microscopically competes with superconductivity in the same band.

Additional Information

© 2007 The American Physical Society. Received 5 December 2006. Published 16 March 2007. We acknowledge discussions with D. A. Huse, P.W. Anderson, S. Sondhi, S. Sachdev, N. P. Ong, A. Fedorov, andW. Ku. This work is supported by DOE Grant No. DE-FG- 02-05ER46200. R. J.C. and M. Z. H. acknowledge support through NSF (No. DMR-0213706). A. L. S. is supported by No. DOE/DE-AC02-05CH11231; SRC/UW is supported by No. NSF/DMR-0537588.

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Published - PhysRevLett.98.117007-1.pdf

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