Physics – Condensed Matter – Superconductivity
Scientific paper
2005-01-31
J. Phys. Soc. Jpn., Vol. 74(4) (2005) 1255-1262 Vol.74 No.4, April, 2005 pp. 1255-1262
Physics
Condensed Matter
Superconductivity
This paper has been withdrawn by the authors, due to a crucial error in the magnitude of magnetic fields used in the experimen
Scientific paper
10.1143/JPSJ.74.1255
Two beta-pyrochlore oxide superconductors, CsOs2O6 and RbOs2O6, are studied thermodynamically by measuring specific heat on polycrystalline samples. It is found that a Sommerfeld coefficient ? is nearly equal, 20 mJ/K2 mol Os, in the two oxides with different superconducting transition temperatures; Tc = 3.3 K and 6.3 K, respectively. This suggests that the density of states at the Fermi level is not a crucial parameter to determine the Tc of the beta-pyrochlore oxide superconductors, which is incompatible with the general expectation for a conventional BCS-type superconductor. Anomalous lattice contributions to specific heat at low temperature are also reported, which may come from nearly localized phonon modes associated with the rattling of the alkali metal ions weakly bound in an oversized cage formed by OsO6 octahedra.
Hiroi Zenji
Muramatsu Takaki
Muraoka Yuji
Yamaura Jun-ichi
Yonezawa Shigeki
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