Observation of gapped quasiparticles in sodium charge-ordered Na1/2CoO2

Y. Xia; D. Qian; D. Hsieh; L. Wray; L. Viciu; R. J. Cava; M. Z. Hasan

doi:10.1016/j.physb.2007.10.276

Observation of gapped quasiparticles in sodium charge-ordered Na_1/2CoO₂

Y. Xia, D. Qian, D. Hsieh, L. Wray, L. Viciu, R. J. Cava, M. Z. Hasan

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

Abstract

Using high-resolution photoemission spectroscopy (ARPES), we present a systematic study of the insulating cobaltates. A single-particle gap opening suggests that due to the material's unique topology an anisotropic particle-hole instability is present. Unlike conventional density waves, charge stripes or band insulators, the onset of the gap depends on the quasiparticle's quantum coherence which occurs well below the symmetry-breaking temperature of the crystal. Results are found to be in good agreement with bulk resistivity, specific heat and optical measurements.

Original language	English (US)
Pages (from-to)	1007-1009
Number of pages	3
Journal	Physica B: Condensed Matter
Volume	403
Issue number	5-9
DOIs	https://doi.org/10.1016/j.physb.2007.10.276
State	Published - Apr 1 2008

Keywords

Frustrated systems
Metal-insulator transition
Mott insulator
Sodium cobaltate
Triangular lattice

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

Access to Document

10.1016/j.physb.2007.10.276

Cite this

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title = "Observation of gapped quasiparticles in sodium charge-ordered Na1/2CoO2",

abstract = "Using high-resolution photoemission spectroscopy (ARPES), we present a systematic study of the insulating cobaltates. A single-particle gap opening suggests that due to the material's unique topology an anisotropic particle-hole instability is present. Unlike conventional density waves, charge stripes or band insulators, the onset of the gap depends on the quasiparticle's quantum coherence which occurs well below the symmetry-breaking temperature of the crystal. Results are found to be in good agreement with bulk resistivity, specific heat and optical measurements.",

keywords = "Frustrated systems, Metal-insulator transition, Mott insulator, Sodium cobaltate, Triangular lattice",

author = "Y. Xia and D. Qian and D. Hsieh and L. Wray and L. Viciu and Cava, {R. J.} and Hasan, {M. Z.}",

year = "2008",

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doi = "10.1016/j.physb.2007.10.276",

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TY - JOUR

T1 - Observation of gapped quasiparticles in sodium charge-ordered Na1/2CoO2

AU - Xia, Y.

AU - Qian, D.

AU - Hsieh, D.

AU - Wray, L.

AU - Viciu, L.

AU - Cava, R. J.

AU - Hasan, M. Z.

PY - 2008/4/1

Y1 - 2008/4/1

N2 - Using high-resolution photoemission spectroscopy (ARPES), we present a systematic study of the insulating cobaltates. A single-particle gap opening suggests that due to the material's unique topology an anisotropic particle-hole instability is present. Unlike conventional density waves, charge stripes or band insulators, the onset of the gap depends on the quasiparticle's quantum coherence which occurs well below the symmetry-breaking temperature of the crystal. Results are found to be in good agreement with bulk resistivity, specific heat and optical measurements.

AB - Using high-resolution photoemission spectroscopy (ARPES), we present a systematic study of the insulating cobaltates. A single-particle gap opening suggests that due to the material's unique topology an anisotropic particle-hole instability is present. Unlike conventional density waves, charge stripes or band insulators, the onset of the gap depends on the quasiparticle's quantum coherence which occurs well below the symmetry-breaking temperature of the crystal. Results are found to be in good agreement with bulk resistivity, specific heat and optical measurements.

KW - Frustrated systems

KW - Metal-insulator transition

KW - Mott insulator

KW - Sodium cobaltate

KW - Triangular lattice

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