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

Qian, D. and Hsieh, D. and Wray, L. and Morosan, E. and Wang, N. L. and Xia, Y. and Cava, R. J. and Hasan, M. Z. (2007) Emergence of Fermi Pockets in a New Excitonic Charge-Density-Wave Melted Superconductor. Physical Review Letters, 98 (11). Art. No. 117007. ISSN 0031-9007. doi:10.1103/PhysRevLett.98.117007.

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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.

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Hsieh, D.0000-0002-0812-955X
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.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG- 02-05ER46200
Department of Energy (DOE)DE-AC02-05CH11231
Issue or Number:11
Classification Code:PACS numbers: 74.20.Mn, 71.45.Lr, 74.50.+r, 74.72.h
Record Number:CaltechAUTHORS:20140908-093938696
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49322
Deposited By: Joy Painter
Deposited On:08 Sep 2014 16:49
Last Modified:10 Nov 2021 18:42

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