Search

CeIr2 was reported as a valence fluctuation compound with a superconducting transition temperature of ~0.3 K. To investigate its electronic and superconducting properties, we measured the electrical resistivity, magnetic susceptibility, and de Haas-van Alphen (dHvA) effect at low temperatures cooled to ~30mK and in high magnetic fields up to 36 T. The upper critical field (µ0Hc2 = 0.23 T) determined by the electrical resistivity under the magnetic field and the electron-phonon coupling constant (λep = 0.39) estimated from the Debye temperature suggested a weak-coupling BCStype superconductivity. The dHvA effect measurements mapped the Fermi surface in detail. The dHvA branches with the frequencies of F = 122-2180 T and the effective masses of m*c = 0:83{2:4m0 (m0: rest mass of an electron) were observed. These were reasonably explained by the band-structure calculation based on the full potential linearized augmented-plane-wave method within the local density approximation. [ABSTRACT FROM AUTHOR]