Study of the magnetic penetration depth in RbOs2O6
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
Abstract
Measurements of the magnetic field penetration depth λin the pyrochlore superconductor RbOs2O6 (Tc6.3 K) were carried out by means of the muon-spin-rotation (μSR) technique. At low temperatures λ-2(T) saturates and becomes constant below T 0.2Tc, 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. μSR 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 RbOs2O6 is isotropic.
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