Magnetic Penetration Depth in Quasi-Two-Dimensional Superconductors with Line Nodes

  • Kubo Katsunori
    Department of Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8571
  • Hirashima Dai S.
    Department of Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8571

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We calculate the magnetic penetration depth λ(T) in quasi-two-dimensional superconductors with line nodes. We find that λ(T)-λ(0) ∝ Tα with α=1 in many cases, but for a class of the order parameter it is possible that α=3 in special field directions; this may help the identification of the symmetry of the order parameter. A recent measurement of the penetration depth in Sr2RuO4 is discussed in light of the present results.

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