2004/03/01 by Y. J. Uemura, P. L. Russo, Uemura, Y. J. +19
Physics and Astronomy · #FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con) #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.cond-mat/0403031
6 pages 4 figures: Contact Y.J. Uemura, E-mail: [email protected]
arxiv created 2004/03/01 · arxiv updated 2009/12/01
Muon spin relaxation (μSR) measurements on the new layered cobalt oxide superconductor Na0.35CoO2⋅1.3H2O and its parent, non-superconducting compounds, have revealed unconventional nature of superconductivity through: (1) a small superfluid energy which implies a surprisingly high effective mass of the charge carriers, approximately 100 times the bare electron mass; (2) the superconducting transition temperature Tc scaling with the superfluid energy following the correlations found in high-Tc cuprate and some other two-dimensional superconductors; (3) an anisotropic pairing without broken time-reversal symmetry; and (4) the proximity of a magnetically ordered insulating phase at Na0.5CoO2 below TN = 53 K.