Nature of Correlated Motion of Electrons in the Parent Cobaltate Superconductors

Details Nature of Correlated Motion of Electrons in the Parent Cobaltate Superconductors Nature of Correlated Motion of Electrons in the Parent Cobaltate Superconductors

2005-01-21

arxiv.org/abs/cond-mat/0501530v2

Annals of Physics 321 (7): 1568-1574 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures, 1 table

Scientific paper

10.1016/j.aop.2006.03.008

Recently discovered class of cobaltate superconductors (Na0.3CoO2.nH2O) is a novel realization of interacting quantum electron systems in a triangular network with low-energy degrees of freedom. We employ angle-resolved photoemission spectroscopy to uncover the nature of microscopic electron motion in the parent superconductors for the first time. Results reveal a large hole-like Fermi surface (consistent with Luttinger theorem) generated by the crossing of super-heavy quasiparticles. The measured quasiparticle parameters collectively suggest a two orders of magnitude departure from the conventional Bardeen-Cooper-Schrieffer electron dynamics paradigm and unveils cobaltates as a rather hidden class of relatively high temperature superconductors.

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