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Complete d-Band Dispersion Relation in Sodium Cobaltates

Qian, D. and Wray, L. and Hsieh, D. and Viciu, L. and Cava, R. J. and Luo, J. L. and Wu, D. and Wang, N. L. and Hasan, M. Z. (2006) Complete d-Band Dispersion Relation in Sodium Cobaltates. Physical Review Letters, 97 (18). Art. No. 186405. ISSN 0031-9007. doi:10.1103/PhysRevLett.97.186405.

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We utilize fine-tuned polarization selection coupled with excitation-energy variation of photoelectron signal to image the complete d-band dispersion relation in sodium cobaltates. A hybridization gap anticrossing is observed along the Brillouin zone corner and the full quasiparticle band is found to emerge as a many-body entity lacking a pure orbital polarization. At low dopings, the quasiparticle bandwidth (Fermion scale, many-body E_F∼0.25  eV) is found to be smaller than most known oxide metals. The low-lying density of states is found to be in agreement with bulk-sensitive thermodynamic measurements for nonmagnetic dopings where the 2D Luttinger theorem is also observed to be satisfied.

Item Type:Article
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Hsieh, D.0000-0002-0812-955X
Additional Information:© 2006 The American Physical Society. Received 28 June 2006. Published 3 November 2006. We acknowledge G. Khaliulin, G. Kotliar, B. Keimer, P. A. Lee, N. P. Ong, D. Singh, Z.Wang, and A. Fedorov for discussions. This work is primarily supported by DOE Grant No. DE-FG-02-05ER46200. R. J.C. acknowledges support by the NSF (DMR-0213706). N. L.W. acknowledges support by the NSFC (10574158).
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG-02-05ER46200
National Science Foundation of China (NSFC)10574158
Issue or Number:18
Classification Code:PACS numbers: 71.20.Be, 71.30.+h, 73.20.At, 74.90.+n
Record Number:CaltechAUTHORS:20140908-085009835
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49309
Deposited By: Joy Painter
Deposited On:08 Sep 2014 17:40
Last Modified:10 Nov 2021 18:42

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