Neutron Scattering Study of the Localized Mode in the beta-Pyrochlore Superconductors AOs2O6

Abstract

Inelastic neutron scattering and neutron powder diffraction experiments were carried out to investigate a localized mode, proposed from various bulk measurements, in the beta-pyrochlore AOs2O6 (A=K, Rb, Cs). The localized mode was identified in all the three compounds as well as another beta-pyrochlore CsW2O6. The anharmonicity of the mode is weak in RbOs2O6 and CsOs2O6 but substantial in KOs2O6.

12 pages, 6 figures; typos and graph corrected

References in corpus (18)

• New Pyrochlore Oxide Superconductor RbOs2O6
• New beta-Pyrochlore Oxide Superconductor CsOs2O6
• Crystal structure of the pyrochlore oxide superconductor KOs${}_2$O${}_6$
• Correlation Effects and Structural Dynamics in the $\beta$-Pyrochlore Superconductor KOs${}_2$O${}_6$
• Superconductivity in Geometrically Frustrated Pyrochlore RbOs2O6
• Second Anomaly in the Specific Heat of beta-Pyrochlore Oxide Superconductor KOs2O6
• Specific Heat of the beta-Pyrochlore Oxide Superconductors CsOs2O6 and RbOs2O6
• Thermal Conductivity of the Pyrochlore Superconductor KOs2O6: Strong Electron Correlations and Fully Gapped Superconductivity
• Study of the magnetic penetration depth in RbOs_2O_6
• Pressure effects on the transition temperature and the magnetic field penetration depth in the pyrochlore superconductor RbOs_2O_6
• Possible Anisotropic Order Parameter in Pyrochlore Superconductor KOs${}_2$O${}_6$ Probed by Muon Spin Rotation
• Frustration in Coupled Rattler System: KOs2O6
• Synthesis of superconducting pyrochlore RbOs2O6
• Uncommonly High Upper Critical Field in the Superconducting KOs${}_2$O${}_6$ Pyrochlore
• Evidence for s-wave superconductivity in the new beta-pyrochlore oxide RbOs2O6
• Erratum to Three Papers on the beta-Pyrochlore Oxide Superconductors
• Intrinsic thermodynamic properties of the pyrochlore superconductor RbOs2O6 extracted by condensation energy analysis
• High Pressure Effects on Superconductivity in the beta-pyrochlore Oxides AOs2O6 (A=K, Rb, Cs)

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• Rattling-Induced Superconductiviy in the Beta-Pyrochlore Oxides AOs2O6
• Low-Energy Optical Phonon Modes in the Caged Compound LaRu2Zn20
• Strong coupling superconductivity mediated by three-dimensional anharmonic phonons
• A Possible Phase Transition in beta-pyrochlore Compounds
• Strong-Coupling Theory of Rattling-Induced Superconductivity
• Neutron scattering study of Kondo lattice antiferromagnet YbNiSi3
• Phonon Dynamics and Multipolar Isomorphic Transition in beta-pyrochlore KOs2O6
• Superconducting and Structural Transitions in the β-Pyrochlore Oxide KOs2O6 under High Pressure
• Superconductivity and Rattling under High Pressure in the beta-Pyrochlore Oxide RbOs2O6
• Novel Rattling of K Atoms in Aluminium-Doped Defect Pyrochlore Tungstate
• Towards a Mechanism of Rattler Coupling in the β-Pyrochlores AOs2O6 (A = K, Rb, Cs)