Journal
ANNALS OF PHYSICS
Volume 321, Issue 7, Pages 1568-1574Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.aop.2006.03.008
Keywords
correlated electron systems; cobaltates; superconductivity; photoemission spectroscopy
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Recently discovered class of cobaltate superconductors (Na0.3CoO2-nH(2)O) 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. (c) 2006 Elsevier Inc. All rights reserved.
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