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Study of the magnetic penetration depth in RbOs_2O_6

R. Khasanov·D. G. Eshchenko·D. Di Castro·A. Shengelaya·F. La Mattina·A. Maisuradze·C. Baines·H. Luetkens·J. Karpinski·S. M. Kazakov·H. Keller
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Abstract

Measurements of the magnetic field penetration depth λin the pyrochlore superconductor RbOs_2O_6 (T_c\simeq6.3 K) were carried out by means of the muon-spin-rotation (\muSR) technique. At low temperatures λ^{-2}(T) saturates and becomes constant below T\simeq 0.2T_c, in agreement with what is expected for weak-coupled s-wave BCS superconductors. The value of λat T=0 was found to be in the range of 250 nm to 300 nm. \muSR and equilibrium magnetization measurements both reveal that at low temperatures $λ$ is almost (at the level of 10%) independent of the applied magnetic field. This result suggests that the superconducting energy gap in RbOs_2O_6 is isotropic.

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R. Khasanov, D. G. Eshchenko, D. Di Castro, A. Shengelaya, F. La Mattina, A. Maisuradze, C. Baines, H. Luetkens, J. Karpinski, S. M. Kazakov, H. Keller. 2004-11-26. Study of the magnetic penetration depth in RbOs_2O_6. https://doi.org/10.1103/physrevb.72.104504

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