Are cobaltates conventional? An ARPES viewpoint

M. Z. Hasan; D. Qian; M. L. Foo; R. J. Cava

doi:10.1016/j.aop.2006.03.008

Are cobaltates conventional? An ARPES viewpoint

M. Z. Hasan, D. Qian, M. L. Foo, R. J. Cava

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7 Scopus citations

Abstract

Recently discovered class of cobaltate superconductors (Na_0.3CoO₂·nH₂O) is a novel realization of interacting quantum electron system in a triangular network with low-energy degrees of freedom. We employ angle-resolved photoemission spectroscopy to study the quasiparticle parameters in the parent superconductors. Results reveal a large hole-like Fermi surface generated by the crossing of heavy quasiparticles. The measured quasiparticle parameters collectively suggest two orders of magnitude departure from the conventional weak coupling (such as Al) Bardeen-Cooper-Schrieffer electron dynamics paradigm and unveils cobaltates as a rather hidden class of relatively high temperature superconductors. These parameters also form the basis for a microscopic Hamiltonian of the system.

Original language	English (US)
Pages (from-to)	1568-1574
Number of pages	7
Journal	Annals of Physics
Volume	321
Issue number	7
DOIs	https://doi.org/10.1016/j.aop.2006.03.008
State	Published - Jul 2006

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

Keywords

Cobaltates
Correlated electron systems
Photoemission spectroscopy
Superconductivity

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10.1016/j.aop.2006.03.008

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title = "Are cobaltates conventional? An ARPES viewpoint",

abstract = "Recently discovered class of cobaltate superconductors (Na0.3CoO2·nH2O) is a novel realization of interacting quantum electron system in a triangular network with low-energy degrees of freedom. We employ angle-resolved photoemission spectroscopy to study the quasiparticle parameters in the parent superconductors. Results reveal a large hole-like Fermi surface generated by the crossing of heavy quasiparticles. The measured quasiparticle parameters collectively suggest two orders of magnitude departure from the conventional weak coupling (such as Al) Bardeen-Cooper-Schrieffer electron dynamics paradigm and unveils cobaltates as a rather hidden class of relatively high temperature superconductors. These parameters also form the basis for a microscopic Hamiltonian of the system.",

keywords = "Cobaltates, Correlated electron systems, Photoemission spectroscopy, Superconductivity",

author = "Hasan, {M. Z.} and D. Qian and Foo, {M. L.} and Cava, {R. J.}",

note = "Funding Information: We gratefully acknowledge P.W. Anderson, N.P. Ong, G. Baskaran, P.A. Lee, S. Shastry, and S. Sondhi for valuable discussions. Experimental data were recorded at ALS which is operated by the DOE Office of Basic Energy Science. This work is partially supported by NSF-DMR-0213706 and the DOE, Grants DE-FG02-98-ER45706 and DE-FG02-05ER46200. ",

year = "2006",

month = jul,

doi = "10.1016/j.aop.2006.03.008",

language = "English (US)",

volume = "321",

pages = "1568--1574",

journal = "Annals of Physics",

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T1 - Are cobaltates conventional? An ARPES viewpoint

AU - Hasan, M. Z.

AU - Qian, D.

AU - Foo, M. L.

AU - Cava, R. J.

N1 - Funding Information: We gratefully acknowledge P.W. Anderson, N.P. Ong, G. Baskaran, P.A. Lee, S. Shastry, and S. Sondhi for valuable discussions. Experimental data were recorded at ALS which is operated by the DOE Office of Basic Energy Science. This work is partially supported by NSF-DMR-0213706 and the DOE, Grants DE-FG02-98-ER45706 and DE-FG02-05ER46200.

PY - 2006/7

Y1 - 2006/7

N2 - Recently discovered class of cobaltate superconductors (Na0.3CoO2·nH2O) is a novel realization of interacting quantum electron system in a triangular network with low-energy degrees of freedom. We employ angle-resolved photoemission spectroscopy to study the quasiparticle parameters in the parent superconductors. Results reveal a large hole-like Fermi surface generated by the crossing of heavy quasiparticles. The measured quasiparticle parameters collectively suggest two orders of magnitude departure from the conventional weak coupling (such as Al) Bardeen-Cooper-Schrieffer electron dynamics paradigm and unveils cobaltates as a rather hidden class of relatively high temperature superconductors. These parameters also form the basis for a microscopic Hamiltonian of the system.

AB - Recently discovered class of cobaltate superconductors (Na0.3CoO2·nH2O) is a novel realization of interacting quantum electron system in a triangular network with low-energy degrees of freedom. We employ angle-resolved photoemission spectroscopy to study the quasiparticle parameters in the parent superconductors. Results reveal a large hole-like Fermi surface generated by the crossing of heavy quasiparticles. The measured quasiparticle parameters collectively suggest two orders of magnitude departure from the conventional weak coupling (such as Al) Bardeen-Cooper-Schrieffer electron dynamics paradigm and unveils cobaltates as a rather hidden class of relatively high temperature superconductors. These parameters also form the basis for a microscopic Hamiltonian of the system.

KW - Cobaltates

KW - Correlated electron systems

KW - Photoemission spectroscopy

KW - Superconductivity

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M3 - Article

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SN - 0003-4916

VL - 321

SP - 1568

EP - 1574

JO - Annals of Physics

JF - Annals of Physics

IS - 7

ER -

Are cobaltates conventional? An ARPES viewpoint

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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