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Laser-excited ultrahigh-resolution photoemission spectroscopy of NaxCoO2.yH2O:Evidence for pseudogap formation

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arxiv cond-mat/0406632 v2 pith:CVD7F6T5 submitted 2004-06-25 cond-mat.str-el cond-mat.supr-con

T. Shimojima , T. Yokoya , T. Kiss , A. Chainani , S. Shin , T. Togashi , C. Chen , S. Watanabe
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K. Takada T. Sasaki H. Sakurai E. Takayama-Muromachi
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classification cond-mat.str-elcond-mat.supr-con
keywords coo2pseudogapenergyformationlaser-excitedphotoemissionscalespectroscopy
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We have studied the temperature-dependent electronic structure near the Fermi level (EF) of the layered cobaltate superconductor, Na0.35CoO2.1.3H2O, and related materials, using laser-excited ultrahigh-resolution photoemission spectroscopy. We observe the formation of a pseudogap with an energy scale of ~ 20 meV in Na0.35CoO2.1.3H2O and Na0.35CoO2.0.7H2O, which is clearly absent in Na0.7CoO2. The energy scale of the pseudogap is larger than the expected value for the superconducting gap, suggesting an additional competing order parameter at low temperatures. We discuss implications of the pseudogap in relation to available transport and magnetic susceptibility results.

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