Angle-resolved photoemission spectroscopy (ARPES) of Na 0.7CoO2

Alexander Kuprin; Zahid Hasan; Yi De Chuang; Zahid Hussain; Dong Qian; M. Foo; R. J. Cava

doi:10.1142/S0217979205028554

Angle-resolved photoemission spectroscopy (ARPES) of Na _0.7CoO₂

Alexander Kuprin, Zahid Hasan, Yi De Chuang, Zahid Hussain, Dong Qian, M. Foo, R. J. Cava

Research output: Contribution to journal › Article › peer-review

Abstract

Detailed study of the electronic structure of the layered Na _0.7CoO₂, doped Mott insulator with triangular Co lattice is performed by angle-resolved photoemission spectroscopy (ARPES). At low temperature Fermi surface is a centered hole pocket of hexagonal character shape in agreement with LDA. A broad valence band satellite at higher energies showing resonant enhancement at the 2p, 3p → 3d excitations indicates large on-site Hubbard-U ∼ 5 eV. A momentum dependent quasiparticle band near Fermi level that is flat and vanished at energies already above 70 meV or 80 meV gives a value of the single particle hopping t < 10 meV. This band is defined only in the region of non - Fermi liquid transport with linear growth of resistivity up to 120 K.

Original language	English (US)
Pages (from-to)	345-351
Number of pages	7
Journal	International Journal of Modern Physics B
Volume	19
Issue number	1-3
DOIs	https://doi.org/10.1142/S0217979205028554
State	Published - Jan 3 2005

All Science Journal Classification (ASJC) codes

Statistical and Nonlinear Physics
Condensed Matter Physics

Keywords

Cobalt oxyhydrates
Electron correlations
Mott insulator
Photoelectron spectroscopy

Access to Document

10.1142/S0217979205028554

Cite this

@article{16d3502231484500a7665f9868992e53,

title = "Angle-resolved photoemission spectroscopy (ARPES) of Na 0.7CoO2",

abstract = "Detailed study of the electronic structure of the layered Na 0.7CoO2, doped Mott insulator with triangular Co lattice is performed by angle-resolved photoemission spectroscopy (ARPES). At low temperature Fermi surface is a centered hole pocket of hexagonal character shape in agreement with LDA. A broad valence band satellite at higher energies showing resonant enhancement at the 2p, 3p → 3d excitations indicates large on-site Hubbard-U ∼ 5 eV. A momentum dependent quasiparticle band near Fermi level that is flat and vanished at energies already above 70 meV or 80 meV gives a value of the single particle hopping t < 10 meV. This band is defined only in the region of non - Fermi liquid transport with linear growth of resistivity up to 120 K.",

keywords = "Cobalt oxyhydrates, Electron correlations, Mott insulator, Photoelectron spectroscopy",

author = "Alexander Kuprin and Zahid Hasan and Chuang, {Yi De} and Zahid Hussain and Dong Qian and M. Foo and Cava, {R. J.}",

note = "Funding Information: The authors are thankful to A. Fedorov, E. Rotenberg, R. Kimmerling, K. Ross-nagel, H. Koh, and B. Mesler for technical support, A.K. acknowledges financial support from ALS, and M.Z.H. partial support through the NSF-MRSEC (DMR-0213706) grant and R.H. Dicke Grant by Princeton University Materials synthesis supported by DMR-0213706 and the DOE, Grant No. DE-FG02-98-ER45706.",

year = "2005",

month = jan,

day = "3",

doi = "10.1142/S0217979205028554",

language = "English (US)",

volume = "19",

pages = "345--351",

journal = "International Journal of Modern Physics B",

issn = "0217-9792",

publisher = "World Scientific",

number = "1-3",

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TY - JOUR

T1 - Angle-resolved photoemission spectroscopy (ARPES) of Na 0.7CoO2

AU - Kuprin, Alexander

AU - Hasan, Zahid

AU - Chuang, Yi De

AU - Hussain, Zahid

AU - Qian, Dong

AU - Foo, M.

AU - Cava, R. J.

N1 - Funding Information: The authors are thankful to A. Fedorov, E. Rotenberg, R. Kimmerling, K. Ross-nagel, H. Koh, and B. Mesler for technical support, A.K. acknowledges financial support from ALS, and M.Z.H. partial support through the NSF-MRSEC (DMR-0213706) grant and R.H. Dicke Grant by Princeton University Materials synthesis supported by DMR-0213706 and the DOE, Grant No. DE-FG02-98-ER45706.

PY - 2005/1/3

Y1 - 2005/1/3

N2 - Detailed study of the electronic structure of the layered Na 0.7CoO2, doped Mott insulator with triangular Co lattice is performed by angle-resolved photoemission spectroscopy (ARPES). At low temperature Fermi surface is a centered hole pocket of hexagonal character shape in agreement with LDA. A broad valence band satellite at higher energies showing resonant enhancement at the 2p, 3p → 3d excitations indicates large on-site Hubbard-U ∼ 5 eV. A momentum dependent quasiparticle band near Fermi level that is flat and vanished at energies already above 70 meV or 80 meV gives a value of the single particle hopping t < 10 meV. This band is defined only in the region of non - Fermi liquid transport with linear growth of resistivity up to 120 K.

AB - Detailed study of the electronic structure of the layered Na 0.7CoO2, doped Mott insulator with triangular Co lattice is performed by angle-resolved photoemission spectroscopy (ARPES). At low temperature Fermi surface is a centered hole pocket of hexagonal character shape in agreement with LDA. A broad valence band satellite at higher energies showing resonant enhancement at the 2p, 3p → 3d excitations indicates large on-site Hubbard-U ∼ 5 eV. A momentum dependent quasiparticle band near Fermi level that is flat and vanished at energies already above 70 meV or 80 meV gives a value of the single particle hopping t < 10 meV. This band is defined only in the region of non - Fermi liquid transport with linear growth of resistivity up to 120 K.

KW - Cobalt oxyhydrates

KW - Electron correlations

KW - Mott insulator

KW - Photoelectron spectroscopy

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