2003/07/31 by B. G. Ueland, P. Schiffer, R. E. Schaak +6
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Characterization (materials science) #Chemistry #Condensed matter physics #Crystallite #Electron #Magnetic and transport properties of perovskites and related materials #Materials science #Metallurgy #Nanotechnology #Nuclear physics #Physics #Physics of Superconductivity and Magnetism #Population #Specific heat #Superconductivity #cond-mat.supr-con
paper · pdf · doi:10.1016/j.physc.2003.08.005
publication information added
arxiv created 2003/08/30 · openalex publication_date 2003/09/22 · arxiv updated 2015/06/24 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
We report results of specific heat measurements on polycrystalline samples of the layered superconductor, Na(0.3)CoO(2).1.3H(2)O. The electronic contribution to the specific heat, gamma, is found to be 12.2 mJ/mol-K2. The feature at the superconducting transition is rather sharp, becoming broad and strongly suppressed in an applied magnetic field. The data indicate a residual normal state electronic specific heat at low temperatures, implying that there is a sizable population of normal state electrons in the samples even below Tc. Inhomogeneity in the Na content, to which the superconducting state is exquisitely sensitive, appears to be the most likely explanation for these results. These results further indicate that special sample handling is required for an accurate characterization of the superconducting state in this material.