Possible Anisotropic Order Parameter in Pyrochlore Superconductor KOs${}_2$O${}_6$ Probed by Muon Spin Rotation

Abstract

Magnetic penetration depth ($\lambda$) in a pyrochlore superconductor KOs${}_2$O${}_6$ was studied by means of muon spin rotation (\msr). The temperature dependence of transverse spin relaxation rate, which is proportional to ${\lambda }^{-2}$, exhibits a considerable deviation from that expected for the empirical two-fluid model ($\propto T^4$), rather obeying a $T^2$-tendency. Furthermore, $\lambda$ apparently increases with increasing applied field, suggesting the presence of nonlinear and nonlocal effects. These findings strongly suggest that the superconducting order parameter in KOs${}_2$O${}_6$ is anisotropic.

5 pages, 3 figures, submitted to J. Phys.: Cond. Matt

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• Mass enhancement, correlations, and strong coupling superconductivity in the beta-pyrochlore KOs2O6
• Chemical trends of superconducting properties in pyrochlore oxides
• Crystal growth, structural studies and superconducting properties of beta-pyrochlore KOs2O6
• Thermal Conductivity of the Pyrochlore Superconductor KOs2O6: Strong Electron Correlations and Fully Gapped Superconductivity
• Study of the magnetic penetration depth in RbOs_2O_6
• Frustration in Coupled Rattler System: KOs2O6
• Effects of Rattling Phonons on the Quasiparticle Excitation and Dynamics in the Superconducting $\beta$-Pyrochlore KOs${}_2$O${}_6$
• Uncommonly High Upper Critical Field in the Superconducting KOs${}_2$O${}_6$ Pyrochlore
• Neutron Scattering Study of the Localized Mode in the beta-Pyrochlore Superconductors AOs2O6
• A second phase transition and superconductivity in the beta-pyrochlore oxide KOs2O6
• Unquenched $e_g^1$ orbital moment in the Mott insulating antiferromagnet KOsO4
• Microscopic properties of vortex state in YB6 probed by muon spin rotation
• Scanning Tunneling Spectroscopy in the Superconducting State and Vortex Cores of the beta-pyrochlore KOs2O6
• Anomalous Flux Pinning in ?-Pyrochlore Oxide Superconductor KOs2O6
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