Study of the magnetic penetration depth in RbOs_2O_6

Details Study of the magnetic penetration depth in RbOs_2O_6 Study of the magnetic penetration depth in RbOs_2O_6

2004-11-26

arxiv.org/abs/cond-mat/0411674v1

Phys. Rev. B 72, 104504 (2005)

Physics

Condensed Matter

Superconductivity

8 pages, 9 figures

Scientific paper

10.1103/PhysRevB.72.104504

Measurements of the magnetic field penetration depth \lambda in 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 \lambda^{-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 \lambda at 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 $\lambda$ 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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