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

doi:10.1103/PhysRevB.72.104504

Study of the magnetic penetration depth in RbOs_2O_6

Superconductivity 2009-11-10 v1

Authors: 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 \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.

Keywords

magnetic penetration depth pyrochlore superconductor muon-spin-rotation BCS superconductor superconducting energy gap

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@article{arxiv.cond-mat/0411674,
  title  = {Study of the magnetic penetration depth in RbOs_2O_6},
  author = {R. Khasanov and D. G. Eshchenko and D. Di Castro and A. Shengelaya and F. La Mattina and A. Maisuradze and C. Baines and H. Luetkens and J. Karpinski and S. M. Kazakov and H. Keller},
  journal= {arXiv preprint arXiv:cond-mat/0411674},
  year   = {2009}
}

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8 pages, 9 figures

Study of the magnetic penetration depth in RbOs_2O_6

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