The influence of chiral surface states on the London penetration depth in Sr$_2$RuO$_4$

Details The influence of chiral surface states on the London penetration depth in Sr$_2$RuO$_4$ The influence of chiral surface states on the London penetration depth in Sr$_2$RuO$_4$

2000-05-19

arxiv.org/abs/cond-mat/0005312v2

J. Phys. Soc. Jpn. 69, 2411 (2000)

Physics

Condensed Matter

Superconductivity

4 pages, 1 figure, the definition of the Nambu field operator introduced, and some typos corrected

Scientific paper

10.1143/JPSJ.69.2411

The London penetration depth for the unconventional superconductor Sr$_2$RuO$_4$ is analyzed assuming an order parameter which breaks time reversal symmetry and parity simultaneously. Such a superconducting state possesses chiral quasiparticle states with subgap energies at the surface. We show that these subgap states can give a significant contribution to the low-temperature behavior of the London penetration depth yielding a $ T^2 $ power-law even though bulk quasiparticle spectrum is gapped. The presence of several electron bands gives rise to interband transition among the subgap surface states and influences the properties of the surface impedance. Furthermore, the surface states lead also to a non-linear Meissner effect.

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