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Vortex Redistribution below the First-Order Transition Temperature in the β-Pyrochlore Superconductor KOs_2O_6
T. Shibauchi, M. Konczykowski, C. J. van der Beek +5
A miniature Hall sensor array was used to detect magnetic induction locally in the vortex states of the -pyrochlore superconductor KOsO. Below the first-order transition…
Neutron Scattering Study of the Localized Mode in the beta-Pyrochlore Superconductors AOs2O6
Kenzo Sasai, Kazuma Hirota, Yohei Nagao +2
Inelastic neutron scattering and neutron powder diffraction experiments were carried out to investigate a localized mode, proposed from various bulk measurements, in the beta-pyroc…
Superconductivity in RhGa and IrGa without Inversion Symmetry
T. Shibayama, M. Nohara, H. Aruga Katori +3
Superconductivity with 2 K was discovered in the intermetallic binary compounds RhGa and IrGa. This is the first observation of superconductivi…
Effects of Rattling Phonons on the Quasiparticle Excitation and Dynamics in the Superconducting -Pyrochlore KOsO
Y. Shimono, T. Shibauchi, Y. Kasahara +6
Microwave penetration depth and surface resistance at 27 GHz are measured in high quality crystals of KOsO. Firm evidence for fully-gapped superconductivity is provided…
Extremely strong-coupling superconductivity and anomalous lattice properties in the beta-pyrochlore oxide KOs2O6
Z. Hiroi, S. Yonezawa, Y. Nagao +1
Superconducting and normal-state properties of the beta-pyrochlore oxide KOs2O6 are studied by means of thermodynamic and transport measurements. It is shown that the superconducti…
Precise Control of Band Filling in NaxCoO2
Daisuke Yoshizumi, Yuji Muraoka, Yoshihiko Okamoto +5
Electronic properties of the sodium cobaltate NaxCoO2 are systematically studied through a precise control of band filling. Resistivity, magnetic susceptibility and specific heat m…