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Quasiparticle Dynamics in the Vicinity of Metal-Insulator Phase Transition in Na_xCoO_2

Qian, D. and Wray, L. and Hsieh, D. and Wu, D. and Luo, J. L. and Wang, N. L. and Kuprin, A. and Fedorov, A. and Cava, R. J. and Viciu, L. and Hasan, M. Z. (2006) Quasiparticle Dynamics in the Vicinity of Metal-Insulator Phase Transition in Na_xCoO_2. Physical Review Letters, 96 (4). Art. No. 046407. ISSN 0031-9007. doi:10.1103/PhysRevLett.96.046407.

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Layered cobaltates embody novel realizations of correlated matter on a spin-1/2 triangular lattice. We report a high-resolution systematic photoemission study of the insulating cobaltates. The observation of a single-particle gap opening and band folding provides direct evidence of anisotropic particle-hole instability on the Fermi surface due to its unique topology. Overlap of the measured Fermi surface is observed with the 3√× 3√ charge-order Brillouin zone near x = 1/3 but not at x = 1/2 where the insulating transition is actually observed. Unlike conventional density waves, charge stripes, or band insulators, the onset of the gap depends on the quasiparticle’s quantum coherence which is found to occur well below the disorder-order symmetry breaking temperature of the crystal (the first known example of its kind).

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Hsieh, D.0000-0002-0812-955X
Alternate Title:Quasiparticle Dynamics in the Vicinity of Metal-Insulator Phase Transition in NaxCoO2
Additional Information:© 2006 The American Physical Society. Received 9 October 2005. Published 2 February 2006. We thank M. Lee for the resistivity measurements on the samples. We gratefully acknowledge D. A. Huse, M. R. Beasley, D. H. Lee, M. Lee, P. A. Lee, N. P. Ong, P. Phillips, S. Shastry, and S. A. Kivelson for discussions. This work is partially supported through the NSF-MRSEC (DMR-0213706), DOE Grants No. DE-FG02-05ER46200 and No. DE-FG02-98-ER45706, and NSFC (No. 10574158). ALS is supported by DOE/BES-DE-AC03-76SF00098.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG02- 05ER46200
Department of Energy (DOE)DE-FG02-98-ER45706
National Science Foundation of China (NSFC)10574158
Department of Energy (DOE)DE-AC03- 76SF00098
Issue or Number:4
Classification Code:PACS numbers: 71.20.Be, 71.27.+a, 71.30.+h, 73.20.At
Record Number:CaltechAUTHORS:20140908-092120910
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49319
Deposited By: Joy Painter
Deposited On:08 Sep 2014 16:52
Last Modified:10 Nov 2021 18:42

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